what's your budget? best is really subjective, are you looking for self learning? most functionality? easy to bolt on? cheapest?

fitech is really popular its tbi, sniper maybe a little better software wise, but both will depend on how good the install is.

port injection is better than TBI but way more expensive to implement and has a lot of other options and tuning scenarios you can get into, coil near plug, sequential vs batch fire etc.