You talk with the experience vets, which includes seasoned Pros, it really doesn't matter as long as you make sure it's a daily ritual. Don't get lazy and miss your daily pins. Now outside of that, I personally believe it really depends on what compound we're talking about when it comes to timing. It may benefit the person to pin certain compounds at certain times through the day, I'm not going into it, unless you post up what compounds you're referring to. Your question is as vague as you can get.
Agreed with @Tyler Durden ........don't be lazy and stay consistent with your injections. You want to keep blood levels as stable as possible.
If you are looking for a 'pre workout' injection your best to go with non estered hormones....TNE, TrNE....these are absorbed very quickly and will give that extra push to get through some of those last reps that you would normally struggle with.