If you want an fconv go for the pro.
It also depends on what other thinghs you want to change on your evo, as for example JUN uses an fcon v pro for their evo, and they program it, but if you don't go for big modifications the apexi should include a few more options with is separate controller, but I don't know a lot about it.
Probably both of them are good choices but you need someone to program it, so it's better if you buy it directly from some tuner as JUN,TOP SECRET or HKS KANSAI.
Claudius will get the fcon v pro soon.