Depends on your roster but most people hate Korg
Personally I don't see how people despise Korg in the SQ. He has life transfer. That should make it trivial.I find the Odin boss tiers faster to run through though
Your roster could handle Tier 8 at least, probably 9 and maybe 10 (although I have not seen it yet).But out of Tier 6 and 7, Tier 7 is easier.