Transmissions is probably the number 1 concern when it comes to a Fiesta and a Focus.

If they fail, repair is possible but costly.

I believe the manual transmission is not so problematic. Fiesta had regular model with manual transmission while Focus, had to get ST variant for manual transmission.

It really depends on what size car you want. Fiesta is B-segment so like Proton Iriz and Focus is C-segment so like Proton Preve