I... can't really see any reason why I'd play any of those on mobile instead of PC. I mean, it's nice that the option exists for people that don't have a PC, but mobile controls are pretty bad for anything beyond tapping on icons.
I will say, I've heard that apparently the best version of the original Valkyrie Profile is mobile-exclusive for some reason, so I'm gonna have to look into emulating that sometime. HD artwork and all the improvements that they forgot to put into the PSP port. Apparently it even has controller support which is good because it shows they're aware of the problem. Square Enix is just a confusing company though, why not port it to PC too if you're going to put the effort into a mobile port.