Braum or leona?

Both are good tank supports. But quite different when you look deeper into their playstyles.

Leona is all about going ham in lane and feeding your carry 5 kills or so in 10 minutes. Leona then transitions into a strong frontline fight initiator for the whole team. Her peeling capabilities late game aren't all that good.

Braum is basically the exact opposite. His main focus is defending your carries. He has some really good peeling potential, only average fight initiaton with his ult.

It basically is, Do you want an offensive, disruptive tank. Or a defensive bodyguard tank.

Braum is a pretty safe pick. Leona is very dependent on how well you can engage with her, and your team follow up.

If you're going balls to the wall aggressive, go Leona, if you're pushed into a defensive lane, go Braum.

I agree with Aziriously, both the champs are very good but they both also perform very, very differently. So it's all up to what your own playstyle is.