Learn the one you love the most.
If there is uneveness in your articulation, problems with passage of the thumb, heaviness of touch, lack of flexibility and/or imagination in phrasing -- it's all going to be heard instantly
I like the one in F major, number 19. I feel that it is true essence of Mozart in there.
Thanks for all the great input everyone. BTW, I forgot to ask - is there a preferred edition (i.e. publisher) for the Mozart PCs ?