Seraph or Behemoth

I have this confusion of what to choose from?? Behemoth or Seraph..I mean I have seen Aojun was Op when meta, now it stays more on the ground than in air... short fly time and long ability reload 22 sec...I was thinking if seraph in future got nerf, will it end like AoJun?? On the other hand Behemoth pilot gives resistance and at the expense of mobility, it gets two more heavy slots..I have the answer and conclusion but still I am confused..with what I should go for?? behemoth or seraph??