Test is Test is Test.
THat's just the ester it's attached to.
Yes but the ester can effect blood levels, how much test you actually get vs ester and therefore overall gains.
If your looking for mass, I like standard testosterone enanthate "cypionate is fine as well" with maybe some sustanon added in as well. When I'm dieting down, I prefer a faster acting test like propionate as I can control it a bit easier and my blood levels don't get as high.