Wow. You are trying to compare two very different cruise experiences. Both the ships and the itineraries are completely different. My inkling, given your stated desire...
"I really enjoy seeing new destinations, so I do not want a mega ship or a lot of nightlife. Food should be good but doesn’t need to be gourmet."
is that Windstar is a better match. In all honesty, these two cruises are so different that I really don't think it should be a difficult decision for you to make. You know what you value most. It really shouldn't be hard to determine which option is the best fit for you.