We’ve done
DCL in Europe once and Celebrity/Princess/Royal/Seabourn several times and I concur with
@tidefan (though carnival would be towards the bottom of my list, it’s fine if you’re just trying to relax between ports). It’s hard to justify the Disney experience premium if you plan to spend more than 50% of your days on shore, and the lack of flexible evening dining options on DCL is especially tough if your goal is to maximize time in port.
We enjoyed our DCL cruise to Northern Europe and would do it again if it was priced the same as Princess/Royal (or less than Celebrity/Seabourn) but unless you’re a DCL die hard or it’s your only chance to sail with DCL, I wouldn’t recommend it for European sailings….though I will say we loved general knowledge trivia on a European sailings in September— it was all American history and almost no Americans in the room, we crushed it.

The main reason I don’t recommend it is because there is so much we want to cram in on sea days it makes the trip even more exhausting! On other lines, we tend to just read on our balcony without feeling any FOMO.