for starters, ive NEVER used dry yeast, and i never will (call me a snob if you must) But my experiences with White Labs and Wyeast have been very different.
1. my beers with White Labs have always been much cleaner tasting with less "yeast bite" than my beers with Wyeast (same size starters made from both sometimes, sometims just pitch both directly)
2. Odd observation, but i feel like Wyeast gets plugged more in the Hombrew community and in Homebrewing Books such as Clone Brews and Beer Captured. To remedy this, i did a little search and came up with a website that makes the WhiteLabs vs. Wyeast Comparison Chart. it gives character of strains, orgins, and which Whitelabs to use in place of a given Wyeast strain... GO WHITELABS.
*here is that site, i hope you guys get as much out of it as i did... really opened my eyes and made me a happy man:
http://www.tc.umn.edu/~engla008/yeast.html
3. My all time favorite yeast is WhiteLabs 500... one DAMN FINE belgian yeast... jeez this is good stuff.