Upvote:4
Long term Schengen visa for tourist multi trips is bit difficult to obtain, unless you show them the reason of your recurring trips, and they agree, as compared to Business Multi entry Long Term Visa. In theory, all countries are supposed to follow the same rules for this C type visa.
Which embassy/country you apply, question will be decided by asking that in which country you will spend most number of days. If number of days in two or more countries are same, the first one you visit will be the one you will be applying. Applicants can't select embassies on their choice or wish.