Load which ever powder is the most accurate. In my rifle, it's RL 15. I haven't seen much difference in velocity between the two. I get 3000 fps +/- with 44 gr. of either powder in my 22" Cooper with the 120 grainers.
If we live long enough, we all have regrets. But the ones that nag at us the most are the ones in which we know we had a choice.
