Though I haven't played thru Ark on PSP, I don't recall any choppiness, just long load times.  Anways, my fav is probably Origin, I loved that game, I'd have to say, atleast at the moment, after that, would be Oath in Felghana, & the Dawn of Ys.  The PCE version of Ys 3 was my first, pretty easy to beat in japanese actually.  I do love that game, probably cuz it was my first, but, it's not my favorite.  BTW, where's the voting area for the PS2 versions of 1-5??  The DS 1 & 2 is....ok, but, thankfully Falcom ported over the Eternal/Complete versions to PSP, unfortunately, probably no one will pick it up, thanks to Atlus picking up the DS ones 
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 though I wasn't totally happy with their translation of various names & places.  As for Ys 7, it has no jumping, believe it or not, but, I'm hearing it's awesome, & am hoping it will be brought over in some manner, whether it be PSP, PS3, etc.  I doubt the PC version would ever get an english release outside of an english patch by fans.