There won't be that much of a difference honestly, but typically it's recommended to run long esters of test 12 weeks ideally to get the most out of it. It hits peak after around week 4, and that gives you 8 weeks of gains or so. Gains usually start stalling 8-10 weeks in because of myostatin, but sometimes can go just a bit longer than 10 weeks, so 12 weeks gives a little cushion and what i recommend
i agree with rick completely... you want that extra 2 weeks in there to maximize what you are getting out of it.... i dont personally feel that 10 weeks is quite long enough and im more of a conservative user than most...