imo go Summoner (=Arcanist), its boring till.lv 90 (untill harder end raid content), but its easy, does ok damage + can help revive too..
...
Dancer is a good choice too, easy but can't unlock asap (might need to play Bard / Archer 1st, get their gear, untill you canplay Dancer).., Bards can play real music in game, incase you have a flair for music playing