FES is the best version on PS2. There's a PSP version that's missing the FES content but has its own new content (playable female protagonist, controllable party members) that just got a price drop on the PSN store.

They're both valid choices.
Quote Originally Posted by JKTrix View Post
I'm not sure if they still make these, but I have one. Amazon.com: PS3 Memory Card Adaptor: Video Games

That's definitely the easiest way to get your own PS2 saves onto the PS3. I'm sure there are old ways of digitally backing up your PS2/PS1 memory cards onto your computer, but that likely involves buying other hardware like a Gameshark or doing some other kinds of modding.
PS2 download games don't use virtual memory cards like backwards compatible PS3's do, unfortunately. They use a new type of save, so importing saves won't work.