The scores
Purina Pro Plan Adult Chicken & Rice Formula: C (58/100) — Chicken, Brewers Rice, Corn Gluten Meal, Poultry By-Product Meal, Wheat Flour.
Royal Canin Indoor Adult: C (58/100) — Chicken Meal, Corn, Brewers Rice, Corn Gluten Meal, Wheat.
How the ingredients compare
Here are the first five ingredients on each label — the part of the panel that drives most of the score under our published rubric:
Purina Pro Plan: Chicken, Brewers Rice, Corn Gluten Meal, Poultry By-Product Meal, Wheat Flour
Royal Canin: Chicken Meal, Corn, Brewers Rice, Corn Gluten Meal, Wheat
The two panels tell nearly the same story from opposite starting points. Pro Plan lists Chicken first — whole muscle meat, weighed with its own water still in it, so some of that top-slot weight is moisture that cooks off. Royal Canin lists Chicken Meal first — chicken already rendered and dried, so it packs more actual protein per gram, though it is a processed meal rather than fresh meat. Neither approach is wrong; they are two valid ways to lead with poultry. From there both recipes converge: corn gluten meal, brewers rice, and wheat appear on both lists, and Royal Canin adds whole corn at the second slot. Corn gluten meal is a plant protein that lifts the protein figure without adding meat. Under our rubric, corn, corn gluten meal, and wheat are lower-value grains and gluten, and they sit high on both panels — which is why these two land together at a mid level.
Where Purina Pro Plan pulls ahead
It leads with real chicken: Pro Plan’s first ingredient is Chicken — whole muscle meat, not a meal or a by-product. For owners who scan the top of a label looking for a recognizable animal protein, that is exactly what they want to see, and it is a genuine edge over a recipe that opens with a rendered meal. The catch is that fresh chicken is weighed with its water still in, so once the kibble is cooked and dried, the dry-matter protein it contributes shrinks. That is why this advantage is real but not decisive: the chicken is genuine and high-quality, yet the brewers rice, corn gluten meal, and wheat flour stacked right behind it still shape the panel. Leading with true chicken is a meaningful point in Pro Plan’s favor, just not a knockout. Shop on Amazon →
You can buy it almost anywhere: Few cat foods match Pro Plan’s distribution. It sits on shelves at grocery stores, big-box retailers, pet specialty chains, and every major online seller, usually without a special order or a wait. Royal Canin is widely available too, but its deeper indoor, breed, and prescription lines are more often found through vets and specialty channels. For an everyday maintenance food, the ability to restock on short notice matters more than owners expect: a sudden switch because the bag ran out is a common cause of stomach upset, and a food you can grab at the corner store removes that risk. Availability is not nutrition, and it does not change the ingredient panel, but a food your cat reliably eats and that you can always find is a practical strength a label cannot show.
A deep bench of formulas: The Chicken & Rice recipe is one entry point into an unusually broad family. Pro Plan also offers Sensitive Skin & Stomach, hairball, weight-management, indoor, urinary, and high-protein Sport options, most built on the same research and feeding-trial backbone. If your cat develops a sensitivity, gains weight, or needs more protein, you can shift within one trusted line instead of starting over with a new brand and risking a rough transition. Royal Canin is famous for its own deep catalog, so this is a strength both share — but Pro Plan pairs that range with its whole-chicken-first sourcing and its everywhere availability. For an owner who wants room to adjust over a cat’s life without leaving a maker they already know, the breadth of the Pro Plan shelf is a quiet but real advantage.
Where Royal Canin holds its own
Chicken meal concentrates the protein: Royal Canin leads with Chicken Meal, and that choice has a real upside. A meal is chicken that has already been cooked down and had its water removed, so pound for pound it delivers more protein than the same weight of fresh chicken. Because the moisture is gone before the recipe is weighed, that first slot holds its protein contribution after cooking rather than shrinking the way a fresh-meat first ingredient does. A named species meal also tells you the source — this is chicken, not a generic poultry blend. So while Pro Plan wins the label-glance test by listing fresh chicken first, Royal Canin’s chicken meal can quietly contribute as much usable protein to the finished kibble. It is a legitimate, less flashy way to put poultry at the front of the recipe. Shop on Amazon →
Engineered for the indoor cat: This is where Royal Canin earns its reputation. The Indoor Adult formula is purpose-built for cats that live entirely inside, and the engineering is genuine. A specific blend of fibers is tuned to help move swallowed hair through the gut and cut down on hairballs. The kibble is shaped and sized so cats pick it up and chew rather than gulp it. And the formula is designed to help reduce stool odor, a real quality-of-life issue when the litter box shares your living space. None of this shows up in a first-five ingredient read, and our rubric judges the panel, not the engineering — but these are deliberate, problem-solving design choices, not marketing. For an indoor-only cat, that targeted formulation is a meaningful reason to choose Royal Canin even though its ingredient list lands at the same mid level.
Unmatched breed and life-stage precision: No mainstream maker slices its catalog as finely as Royal Canin. Beyond this indoor recipe, the brand offers formulas tuned to specific breeds, exact life stages, and clinical needs, each adjusting kibble shape, fiber, and nutrient balance for the target cat. That precision is a genuine engineering achievement and a real reason owners and vets reach for it — a Maine Coon kitten and a senior indoor cat are not asked to eat the same thing. Pro Plan has a broad lineup too, but it does not segment by breed the way Royal Canin does. Our rubric looks at the ingredients in front of it, so this tailoring does not change where its panel lands — yet for an owner who wants a recipe matched closely to their particular cat, Royal Canin’s depth of specialization is hard to match.
The bottom line
Put side by side, Purina Pro Plan Adult Chicken & Rice and Royal Canin Indoor Adult finish even. Both are research-driven, feeding-trial-substantiated, vet-counter staples, and both build their recipes on a corn, gluten, and grain structure that holds their ingredient quality at the same mid level for an obligate carnivore. The tie-breakers are about fit, not quality. Lean toward Pro Plan if you like that it opens with real chicken, you want a food you can buy on any shelf at a moment’s notice, or you may need to move within one family as your cat’s needs change. Lean toward Royal Canin if your cat lives strictly indoors and would benefit from its hairball fiber, easy-to-chew kibble, and stool-odor control, or if you want a recipe matched to a specific breed or life stage. Neither is a downgrade from the other. Pick the one whose strengths line up with your cat — you are choosing between two equals.