I've really loved Spectral Souls. It's a great combination of the best parts of RPGS for me; there's a (albeit linear) job system, upgrade paths (for weapons), chained powers, etc. There's also a non-linear story system which creates a really interesting experience. However, it lacks non-battle gameplay and can be a bit heavy on the dialog.
Yesterday I purchased the first chapter of Final Fantasy Dimensions but the real-time battle system crossed with the colossal amount of battles (read: every 10 seconds) has rendered it rather dull for me.
The other Final Fantasy's were fun… Chaos Rings was good too… I want to try Drakerider but I can't play it with an iPad 1 due to the lack of gyroscope. I'm quite into simulations (I buy every Kairosoft game without reading the review) but I had an issue with Adventure Bar Story saving and haven't got back to it.
Really appreciate any recommendations?