Gorilla Mode is the more loaded formula, adding 5g creatine and 4g HydroPrime glycerol powder along with higher betaine and tyrosine. Bulk Black is smaller but includes 4g beta-alanine plus a focus stack with L-tyrosine, AlphaSize Alpha-GPC and 200mg L-theanine. Bulk Black does not contain huperzine A.
Gorilla Mode adds 4g HydroPrime glycerol powder at 65%, providing approximately 2.6g glycerol, along with 4g betaine and 5g creatine for a much stronger fullness emphasis. Bulk Black uses 8g citrulline malate and 2.5g betaine.
400mg vs 325mg is a meaningful difference. Gorilla Mode delivers the harder stimulant dose, while Bulk Black uses less caffeine and adds L-theanine for a more restrained profile.
Bulk Black gives 30 full servings while Gorilla Mode gives 20 full two-scoop servings. Current retailer pricing should determine which offers the better cost per full serving.
Both Transparent Labs and Gorilla Mind currently publish product testing information. The more useful differences in this comparison are formula design, stimulant dose and intended use.
Gorilla Mode is the bigger build — more caffeine, 5g creatine, glycerol, higher betaine and tyrosine. If you want a do-it-all loaded pre-workout and creatine bundled in, it makes sense.
Bulk Black is smaller but more controlled, keeps 4g beta-alanine, adds a real focus layer and gives 30 full servings. Both brands publish testing info, so that isn't the deciding factor — formula fit and how much stimulation you want are.