i was always told that the 1.8s were the better option.
Also, if you're looking for a head, i have a fully rebuilt 1.8 with HD valve springs in Montreal. 0 miles on it.
That is due to port size, I do believe that the valve sizes are the same. Based upon the profiles of the two, maybe the one on the left might flow more, but the one on the right might add a little bit more swirl to the charge. Those are intakes, correct? If not, it doesn't matter.
Tradition is the art of making the same mistake repeatedly, on purpose.