Tom knows my preferences well - I LOVE Crystal!!! But, having never been on Seabourn I can't compare the two. As Tom already mentioned, due to the size variance, they offer totally different experiences. That said, if you are planning a spring 2006 cruise - you may not have a choice. To my knowledge, the only Greek Island cruises that Seabourn offers next spring are those that are longer grand voyages in which the Greek islands are just a very small portion of the itinerary and they may not be what you had in mind.