Well, Clyde and I are trying the Sojourn in November. Since we've been on he Odyssey there really will be no suprises for us. We like Seabourn but do miss the perks of being Platinum on Regent. As Ngaire says, you really can't go wrong on any of the top three cruiselines.
My take on the suites is that when we first entered our Odyssey suite my first impression was that it is narrower than Regent. Don't know if this is actually true or not. Other than that, they are very similar. The layout is better, though, on the two bigger ships than on the little triplets. (You can fall out of bed into the bathroom if there is a rough sea!!) Just kidding, Marcie.