Have a 6* selector about to expire. Looking for chars that are useful in PvE. Who would you choose between: AO, Hela, Heimdall, Singularity, Hulkbuster, RR, Mantis, Wasp, Titania, She Hulk, Elsa.
I know Hela is farmable in via story mission but I'm currently stuck on 11-1.
Definitely AO, although he is farmable too. Mantis is also a great choice.