Who should I rank up?

Dave2442

Hi guys! Below are all my 4* Characters. I would like to know your advice on who I should rank up and invest my gold in. Thanks!

I was thinking Spider man because I need some good Defenders for AW.

SavageAssSlaya

Defenders don't matter in war anymore, rank up attackers that would be good

Vartox

AA or DV

4fun

Loki is the absolute only choice luky I am over here like yay another 2*