I see that all runs are done in the european version. Is that the optimal or which are the differences with the american release??

Planning to run the PSP version on PSTV

I don't believe there are any differences, all runs are on the EU version so far because all the runners are from the EU I guess.
The Japanese version IS different however.

Well, if I don't get a second PSTV for my mexican account maybe I'll go for the EU version in my actual one which has a UK account

Thanks