Delts because they hurt only a little and don't interfere with any of my lifts.
Pecs might be number one as they are the least painful inject for me, but every couple of injects the oil decides to be a bitch and migrate it's way to the nip area makin you gyno noid. Also tend to get blood spurts alot on them.
Traps aren't too bad, except they swell up abit giving my traps a slightly off center look.
Won't inject quads again. All my injects give me knots. Knots in the quad=PAIN.
Glute=would use, but I can't fuckin reach around without sending my back into lockup plus I drive around alot so that would suck ass, literally.
Probably gonna try triceps soon.