Act 7 exploration or 8.1

GreenRaptor413

What should I try to explore first? I feel like my roster is fairly limited. I think I am going to r3 moleman soon because of his versatility, still have a generic 2-3 gem from act 7 completion.

SoSA__Remake

8.1 is far easier, and you get a 3-4 rank up gem crystal.

Marouen

8.1 very easy

13579rebel_

8.1

YsF

This is how I did it:
Act 7 Completion
Act 7.1 Exploration (Act 8.1 wasn't out yet)
Act 8.1 Completion and Exploration
Act 7 Exploration (tbd)