Who I should make 10 stars next?

Hey guys , I have just got enough fragments to get my Maven to 10* & I don’t know who I should upgrade next…I have like 7 or 8 heroes on 8 stars and i want your help with that , feel free to take a look on my game profile its ( GURU 97)

From a progression standpoint, it’s probably best to get heroes to 10* that you’re able to farm frags for pretty effectively. Maven is good since you can get heronium from gauntlet now. If you play PvP at all, then I’d recommend getting a PvP store hero to 10* so that you have another heronium source.