If you do some searches on this site you will find some discussions on exactly your subject.
The boats are very similar but different. Sailing characteristics are same. Cockpit is identical today, and I think as far back as both were built. You need to determine which salon and head placement you like best because as the end of the day that is the real difference. I won a 34 MKII, and love the 36 as well.
Both the 34 and the 36 have very active owners groups with lots of information on them. You could also join the online community and ask your question there.