Depending on what provides the most debuff and DoTs access, will depend on whether I play as Arcanist or Summoner. To tell you the truth, arcanist/summoner wasnt even on my radar (im usually melee only) til I read the part about DoTs and debuffs. So even if summoner has powerful avatars, if they dont have access to the most/best DoTs and debuffs, Ill likely ignore summoner and play as Arcanist.

I guess the biggest factor in all that is just how much are they changing class vs job functionality for 2.0?