I installed the free versions of ADW and Launcherpro and played with them most of the week. Both had features that I liked that the other lacked, but I was leaning toward ADW. Yesterday I found out the paid version of ADW had the main feature I liked that was lacking on the free version. I purchased the ADW ex and have been extremely pleased with it.
So, my advice would be load both along with a home switcher app. Then take four or five days of actually using them to see which you like best. If one is lacking in some respect, look at the added features on the paid versions and see if that helps with the decision.
Good Luck!