H!Jakob or W!Lissa

So if you really care about your arena score go for Lissa because she has the highest bst at 175. If you don’t care H!Jacob is very good.

Imo, I'd go for H! Jakob since you already have three traingle covering walls. He could also be possibly used to bait out B! Lyns, etc.

Agreeing with @LarryTheLizard, W! Lissa for Arena BST, she is amazing.

It mostly depends on their role and your strategy.

Both are great units, and either one can be optimized well in your team.