The reading I’ve done says Test E and Test C are practically interchangeable for most people. Cypionate is marginally longer acting, while enanthate provides slightly more testosterone per labeled milligram because of ester weight, but neither difference is meaningful enough to drive the decision. I’d pick whichever reputable preparation you tolerate best. Supertest/multi-ester blends work, but they’re not inherently more anabolic and give you more complicated pharmacokinetics. And I definitely wouldn’t select testosterone simply by finding the highest mg/mL—400–500 mg/mL preparations may save injection volume, but often require more aggressive solvent systems and can produce substantially more PIP. For most people, a boring, well-manufactured 200–300 mg/mL Test C or E is the more predictable option.