Atlus and Arc System Works both have have talented composers. Shoji Meguro has been composing music for Atlus games since the original Persona, while Daisuke Ishiwatari's talents have played a heavy role in the mood and feel of the Guilty Gear and BlazBlue series. Both of them have also demonstrated a lot of range over their various projects.
So that being said, which would you rather serve as the composer for TUIMA? Meguro, of course, is a part of the Persona team and composed the music for Persona 4, while Ishiwatari has more experience in composing for fighting games, and if asked to create covers, could probably do justice to Meguro's original works.
For comparison, some of Meguro's works:
Persona 3 - The Battle for Everyone's Souls:
Shin Megami Tensei: Nocturne - Reason Battle:
And here are some tracks that Ishiwatari has composed:
BlazBlue: Continuum Shift - Sword of Doom
Guilty Gear X - Awe of She
Personally, I'd be fine either way, but I'd be interested to hear what sort of Persona-themed tracks Ishiwatari could produce. How about you guys?