2* levelling while waiting for 3* covers

I’ve accumulated a ton of ISO waiting to level 3* characters, sadly, the covers are slow in coming.

Do I continue to wait to get the 3* covers, or should I pump ISO into more 2* characters?

All my 2* characters have max covers and pretty much the best builds (still need to respec a couple of them).

Thor, 2* Wolvie, OBW are maxxed already.

Levelling candidates and their current levels:
C. Storm - Lvl 70
Ares - Lvl 65
MMN - Lvl 51
Daken - Lvl 26
Cap - Lvl 25
Moonstone Lvl 16
Mod. Hawk Lvl 15
Bullseye and Bagman are Lvl 6

My 3* characters that I could level up are Classic Magneto (currently Lvl 15) to 51, but his build is currently 1/4/1, so I don’t think he will be all that effective yet, or Spider Man (4/3/4 Lvl 60), but he’s due to be unbalanced (and I only have 3 blue covers anyway).

I’m leaning towards maxing Ares and Daken as I’d like to do better in PvP.

Thoughts?

Really just depends on how your current team is doing in pvp. Daken/ares wont significantly improve your pvp team, as they are just substitutes for thor/wolvie. If youre finding that you run out of health packs often and need these substitutes, then that might be an okay reason. Otherwise, id save up for 3s or for buffed 2s in pve events (which typically wont be das like ares/daken).