473nm is my favorite today. If I could, I would vote for 532nm as well.
IMO, its more than just power and color. Beam specs are a contributing factor for me.
Don't get me wrong... I love the colors attainable from diodes, too (445nm, 635nm, 808nm is an awesome cherry red!)...
Maybe it's just me, but a clean, sharp beam of a DPSS laser is so much more appealing.
My girlfriend likes the 445nm better than 473nm, but her favorite is yellow, and she's trying to get me to buy a 589nm now.