Quads are by far my favorite and are very easy. And if you can handle it try delts but splitting it into two shots and hitting both in the same day.
I do this personally because with higher volume shots and ED injections you have to work with what you've got. It has become easy and i dont prefer to go over 1.5 ml in my delts. I have tried 2 ml and no matter what i do i experience leakage of the oil after i remove the needle.