Both are very commercial.. if thats what youre looking for.. plenty of very pretty/nice resorts to choose from, etc..
That said, IMO there are better bangs for your buck than Mexico these days if youre wanting to do an international destination for your honeymoon..
Check out Costa Rica and Belize.. plenty of resort options similar to what youre going to find in PDC or Cancun in terms of amenities, attractions, quality, etc.. and both are far less "americanized" as you describe Cancun..
Cost of flights to Costa Rica are generally only about $100 or so more than most tourist destinations in Mexico.. and once you get there the cost of hotels, food, activities, etc.. are usually cheaper.. so that offsets the additional airfare..