The Wonder will always be where our heart is. It's easy to think of the classic ships as "smaller" when in fact they are huge. It's just the newer ships are huger. The classics feel more personal, more traditional, much much less crowded on the ship and at CC, but with all the great services - MDRs, Palo, Shows, kids clubs, entertainment, adult areas, etc.
Although really once you board you are immersed in the Disney experience no matter which ship. I feel very comfortable and "at home" on any of the ship, just a bit more so on the classic ships.