Injecting twice per week obviously gives much more stable values, but I honestly see no difference pinning the Enanthate ester once or twice per week. An obvious advantage is not having to inject as often by doing once per week, but I don't see any additional benefit besides that and I also don't see any further benefit doing twice per week either other than cutting down oil volume. .
On paper, it makes sense for 2x week injections for stability...but your body won't notice a difference either way.
I'm cruising right now with 200mg per week test enanthate and only injecting once per week. Taking half lives into consideration, cypionate would be better for this, but I see no perceivable difference between once or twice per week. I decided to keep running test E since its what I always use on cycle, and I didn't want to have to switch esters after blasting.
Yeah, we're talking like a 2 day difference so you won't notice anything in how you feel, especially on higher doses.. Your blood values on days 6 and 7 will be different but you won't physically feel any difference.