I go on annual jazz cruises. For the last 15 years, they have been on Holland (Eurodam, Maasdam, Oosterdam, Rotterdam, Westerdam, perhaps others). In 2017, the travel agency that puts these together (they buy out the whole ship, then hire musicians, then resell to us) is switching to Celebrity (Summit).

For those of you familiar with both lines, how would you compare them?