I would travel on either depending on itinery, cost and timing. We did Oceania's Baltic because in a Concierge Cabin A the price for 15 days was equal to the 7 day Regent. But at the end of the cruise we did have to add in the additional costs of tips, alcohol and soft drinks. We loved the itinerary but we went with the expectation that we were not getting the luxury product of Regent - but pretty darn close. Service was excellent, our room was lovely - but much smaller and on a very port intensive cruise, we were content. You have to look at what expectations you might have and know what you expect.