dtgreene: That seems to be more of a WRPG thing. JRPGs tended not to change the perspective, except for the transition into 3D (well, and sometimes having tile graphics with some tiles being high enough to hide what's behind them).
DiffuseReflection: True, but there are few first-person JRPGs in general I think (I might just lack knowledge of them though). The Etrian Odyssey dungeon crawlers are one exception that comes to mind, but that series does have one spin-off, Etrian Mystery Dungeon, which changed the perspective into an overhead 3D one.
The Etrian Odyssey games feel more like Wizardry than like JRPGs to me; in fact, I would classify them as Wizardry-likes.
(Etrian Mystery Dungeon I'm not familiar with, but my guess from the title is that it's a roguelike, just like all the other Mystery Dungeon games. Also, I really wouldn't count spin-offs as part of the series for purposes of this discussion.)
rtcvb32: I'd say Isometric. It's easier to code, easier to deal with sprites, you know the exact distance of most things, no tricky math... can run it on a gameboy and some calculators...
With monochrome graphics, it feels like isometric would be too cluttered to be playable with so few color choices.
Tile graphics work better.