We have cruised with Seabourn many times, but have sometimes been disappointed at the limited opportunities to ballroom dance. Crystal has much more dancing so we decided to try a short cruise. In general, we found the level of service from servers and cabin crew to be comparable to Seabourn's. Facilities were also comparable.
However,the increased size of the ship (Seabourn has less than 500 passengers and Crystal has over 1000) may have been partly responsible for a major difference which was the interaction between upper level personnel and guests. On Seabourn, every staff member seems to have the mission of providing every guest he encounters with an additional reason to be enjoying the cruise. Whether it's just a warm hello or an intervention to solve a problem, on Seabourn, every staff member, from the cabin stewardess to the captain, is "dialed into" the guest's pleasure. Not so on Crystal. The officers and administrative staff appear are likely to pass a passenger without even giving eye contact. It was obvious to both my husband and me that staff regularly turned away, rather than acknowledge either of us.
Another difference was the issue of gratuities. Although we do give gratuities on Seabourn, most passengers do not and staff do not expect it. On Crystal, gratuities are very much expected and food servers, in particular, go out of their way to form a relationship with you which tightens as the cruise is ending. The gratuity was almost expected.
Unbelievably gorgeous. Ridiculously expensive. Too large for only two people. Perfect if traveling with kids or third person. Very small verandah.