I’ve only ever taken t-cyp, but most sources will tell you that the two are pretty much interchangeable. If there’s a difference in how long they last it’s minimal. I did a little comparison shopping at one point and it looked like generic t-cyp is a little cheaper than generic test-e here in the US, though neither will break the bank for most folks. Your doc will probably prescribe t-cyp, and I don’t know of any reason to argue about it – save your arguments for things like timing and frequency of injections, AI if needed, etc.