Board Thread:Questions and Answers/@comment-199219-20150622163509/@comment-26243141-20150623070402

IMO, you can revert them back to pots value (on market) to make a guess. Mephistopheles, albeit the least desirable *7, is priced around 250 pots (or 300, because the market only allow that).

Vlad+2 is only around 100 pots (and less, if you get her yourself).

Astraia+1 is quite rare, but she isnt strong enough anymore. You can get astraia+2 with 300 (even 250) pots these day, so Meph is sure more expensive than her.

Cerberus +2 is just lowballer messing around. Forget it.

IF u insist on choosing, I'd choose no.2. But, Simkiel+2 is cheaper than Astraia, and offers more, so take that in mind.

Depending on your level and needs, I'd rather keep Meph for possible future evo, or trade him on bazaar for some good *6+2 that will help you much. Examples are Azaria+2, Haniel+2, and / or Avi+2. These are cheap good units, and you can possibly get 2 out of 3 from only 1 Mephis.