Hello there Casio!
Well there´s only 1 P2P Server
Summoner just got patched does more DMG again and is good for healing. Engi and Bard as Support also not doing too bad dmg I guess still. I think more likely if you´re open to play anything really you might want to see with people in your guild what is needed the most. For NA players it might be a bit harder depending on the time difference but on P2P aren´t that many active players I guess they usually play during the evening Server time.
Hope that helped already!
Greetings!