Actually, difficult to answer your questions as there are many factors:
I think Babolat storm series is the control type racket for experienced player. It is usually heavier and you will need to generate your own power.
In general, a few factors to affect your choice:
Weight : Today there are many versions of racket for the same model but different weight (e.g. pro, lite, team).
heavier racket - if you can prepare well and swing fast enough to hit the ball clean. You can hit the ball more solid.
lighter racket - If you swing slowly and often late in timing. This can help your slow swing.
Head Size : Small size can move through air easily and good for single backhand and volley
Small head size (e.g. 93 sq in) - more difficult to hit the sweetspot and hence less powerful
Larger head size (100 or 103 sq in) - easier to hit the sweet spot and give more power from the racket
Construction : Thinner racket (18-22mm) is usually control racket and less powerful. Thicker racket (24mm-26mm) usually gives more power.
I think smaller number is better. e.g. 16/19. String bed is more open to bite the ball