Yeah if I replay ToP, it'll definitely be the PS1 version that I also have a fan translated version of, and having played a little bit of it, the improvements are already incredibly obvious and I'm not just talking about the visual and sound quality.
Phantasy Star IV on the Genesis was really damn impressive for its time as well(and really fucking expensive) and much like Chrono Trigger(PSIV came first) it had allowed you to perform combo attacks with multiple characters simultaneously. The music, while excellent for the Genesis imo can't compare to the beautiful soundtracks of FF4-6, CT, SoM, Terranigma etc though. The Genesis could definitely pump out some awesome music but I just prefer the SNES' sound chip, although I'm definitely biased because of the fond memories I have of playing badass SNES games. Sound wise, it just had more tools to work with.