around level ~50 right after the chairman incident explored tartarus until the next mini-boss.
I like to have personas to choose from, have 1 for every main element(agi, bufu, zio and garu) and like 2 or 3 of physical damage and support.
I have Samael too, but of what you listed only has Megido, Mudoon and Mamudo, but is only weak against hama skills, has good stats and mine has Auto-Sukukaja and Masukunda IIRC so is a good deal
I prefer using Cu Chulain, has sightly better stats and has Matarukaja and Survive Dark to compensate his weakness to mudo skills.
Titania is my main healer now, has Divine Grace and paired with Mediarama fully heal all the party.
don't remember my other personas now, but that is pretty much what I have.