For me... It's rather hard selecting targets/people when it comes to using controller. And my hotbar is totally a mess. I hate it. But I can't complain because hey, I'm playing this game. (I would PC if my PC is free from my siblings.)
I like using buttons for certain things. I tried having all healing stuff one side and then DPS/Attack stuff on the other but it just didn't work out for me. I'm right handed so everything on the hotbar to my right, I react faster to it. So its rather frustrating trying to get your mind and fingers to memorize which action button is for what. It takes a lot of time to get used to for me, I don't know about you. Everyone is different. You could possibly be better.