The answer to the question is whatever ball works for the lane condition you are bowling on that day. I bowl with approx the same ball speed as you and I am old school and still hit up on the ball a lot, creating a lot of revs. And at the ball speeds you and I throw at, reactives tend over-react on the back ends. So you you want to find balls and drilling patterns that burn up a little through the mid lane so that you avoid that snap on the backend. Urethane gives you that more mild backend reaction.
Reactives give you a stronger reaction to friction than urethane. If you can find older reactives, those cover stocks are milder in today's lane conditions.
There are some professionals that bowl with no thumb that exclusively use urethane. Any even Jason Belmonte who is considered one the of best two-hander (no thumb) bowlers on the planet, if not the best, will tell you he can struggle on shorter patterns because even with his ball speed over 20 mph when he needs it, his excessive rev rate still makes the reactives too strong.
With your ball speed, I would suggest I you have all three actually, mild cover reactive, urethane, and plastic with a core. That gives you the most versatility to find the best reaction on any given day.
