I think the mk1 is a better looking car, but I'd assume the mk2 ph1 is safer and in 3yrs, I barely had an issue with mine, which is probably more important in a first car. I didn't have my mk1 long enough to experience any probs. Got both when I was 18 btw.
Also, you may appreciate the extra space in the mk2 if you like having passengers in the back, and I think it's a nicer place to sit.
I'd love another mk1 but would have to be a valver or williams. My 1.4 mk1 was a hoot so would love more power handling in that little shell.