Best Protein Powders 2026: Whey Blend vs Isolate vs Plant-Based Compared — Gold Standard, ISO-100, and Sunwarrior Ranked

Protein Powders Ranked by Protein Density (Protein per 100 Calories)

Protein density is the fairest way to compare powders with different scoop sizes and calorie counts. Here's how the three verified powders stack up, using each brand's own per-scoop or per-serving label numbers.

The two whey powders lead on density and total protein per serving, with ISO-100's leaner flavors (Fruity Pebbles, Cookies & Cream) edging out Gold Standard by roughly two grams of protein per 100 calories. Sunwarrior's plant-based Refresher ties Gold Standard on density but delivers less than half the protein in absolute terms — it's built to be a light top-up, not a full-size shake.

Full Nutrition Facts: All Three Side by Side

Both whey powders also carry 5.5g of naturally occurring BCAAs per scoop — ISO-100's includes 2.6g of L-Leucine, Gold Standard's roughly 2.5g. Sunwarrior's Refresher, being a much smaller serving, isn't marketed on BCAA content.

Sweeteners: The One Category Where Sunwarrior Stands Alone

Every whey powder here relies on artificial sweeteners. ISO-100 uses sucralose plus stevia; Gold Standard uses sucralose plus acesulfame potassium (Ace-K) — the same combination found in several ready-to-drink shakes we've verified, like Premier Protein. If avoiding artificial sweeteners matters to you, neither whey option qualifies. Sunwarrior's Clear Protein Refresher is the exception: it's sweetened with stevia and monk fruit only, with no sucralose or Ace-K anywhere in the ingredient list.

The trade-off is scale. Sunwarrior's clean sweetener list comes attached to a much lighter product — 10g of protein per serving, meaning you'd need roughly 2.5 servings to match one scoop of Gold Standard or ISO-100. It's a genuinely different use case (a light, refreshing protein top-up) rather than a drop-in replacement for a full shake.

Whey Isolate vs Whey Blend vs Plant Protein: What Actually Differs

• ISO-100 (100% hydrolyzed whey isolate): no whey concentrate blended in, so it carries the least carbs, fat, and lactose of the three. The hydrolyzed portion is pre-digested for faster absorption. Contains soy lecithin for mixability, which matters if you have a soy allergy.
• Gold Standard Whey (isolate-first blend): whey protein isolate is the first ingredient, with whey protein concentrate second — near-isolate purity at a lower price than a pure-isolate product, plus more flavor variety (15+ flavors vs ISO-100's smaller core lineup).
• Sunwarrior Clear Protein Refresher (barley + rice): fully plant-based, vegan, soy-free, and dairy-free. It's formulated as a thin, water-soluble drink rather than a creamy shake, so it fills a different role — hydration and a light protein boost rather than a post-workout recovery shake.

None of the three is dairy-free except Sunwarrior's. Both whey options contain milk and are unsuitable for a dairy allergy, though Gold Standard includes added lactase and digestive enzymes that some lactose-sensitive users tolerate.

Which Protein Powder Should You Actually Buy?

• Best protein density: Dymatize ISO-100, especially the Fruity Pebbles and Cookies & Cream flavors at 110 calories for 25g of protein.
• Best value per scoop: Optimum Nutrition Gold Standard Whey — nearly the same protein and density as ISO-100, typically at a lower price, with far more flavor options.
• Avoiding artificial sweeteners entirely: Sunwarrior Clear Protein Refresher is the only one of the three with none — but expect a much lighter serving of protein.
• Vegan or dairy-free: Sunwarrior is the only plant-based, dairy-free option here.
• Mild lactose sensitivity, want fastest absorption: ISO-100's hydrolyzed isolate carries the least lactose and digests quickest.

For a wider look at how powders compare to bars and ready-to-drink shakes, see our whey vs plant-based protein comparison and best ready-to-drink protein shakes guides, or browse the full protein snacks directory.

Frequently Asked Questions

Which protein powder has the most protein per calorie?

Dymatize ISO-100, at up to 22.7g of protein per 100 calories in its leanest flavors (Fruity Pebbles, Cookies & Cream, both 110 calories for 25g protein). Its richer flavors like Gourmet Chocolate land at 120 calories for the same 25g, or 20.8g per 100 calories.

Is Optimum Nutrition Gold Standard Whey as good as Dymatize ISO-100?

For general daily protein and post-workout recovery, yes — both deliver comparable protein and BCAA content. ISO-100 is a pure hydrolyzed isolate with slightly less carbs, fat, and lactose; Gold Standard is an isolate-first blend that usually costs less per serving and comes in more flavors.

Is there a protein powder with no artificial sweeteners?

Of the three powders verified here, only Sunwarrior Clear Protein Refresher avoids artificial sweeteners, using stevia and monk fruit instead of sucralose or Ace-K. Both whey options (ISO-100 and Gold Standard) contain sucralose.

Which protein powder is vegan?

Sunwarrior Clear Protein Refresher is the only vegan, dairy-free option of the three, using a barley-and-rice protein source. Both ISO-100 and Gold Standard Whey are milk-based and unsuitable for a dairy allergy.

Can I use Sunwarrior Clear Protein Refresher instead of a full protein shake?

Not directly — it's built as a light, 10g-protein water drink rather than a meal-style shake. To match the 24–25g in a scoop of Gold Standard or ISO-100, you'd need roughly two and a half servings, so it works best as a top-up or hot-weather option rather than your primary protein source.

Bottom line: Dymatize ISO-100 wins on pure protein density, Optimum Nutrition Gold Standard Whey delivers nearly identical numbers at a friendlier price, and Sunwarrior Clear Protein Refresher is the only artificial-sweetener-free, plant-based option — just at a much lighter serving. There's no single best powder; the right pick depends on whether you're chasing protein purity, budget, or a clean-label, dairy-free ingredient list. Compare full flavor breakdowns in our Dymatize ISO-100, Gold Standard Whey, and Sunwarrior Clear Protein Refresher guides, or browse the full protein snacks directory.