My vote is for the smaller ships. In May I sailed on Radisson's Navigator and loved it!
Initially, I was put off by her size, thinking " bigger is better" and never having sailed on a "luxury" line I was apprehensive.... not anymore! No lines, plenty of room at the pool, exceptional service... I could go on and on.
I was so impressed, I booked another cruise in Feb. for 11 days and can't wait.