If you play tourney BPS aint an issue (99% of hoppers will chuck paint at 10.5bps) so you may want to look at reliability, ease of cleaning, battery life and cost.
Rotor is by far the best followed by any of:
Vlocity
Reloader B
Prophecy-personally didnt like
Pinokio-As above
Halo B (or new invert 2)
Pulse
Tried all above all personally use a Rotor for ease of use and field strippable (although never needed too)