What do you use root for? If it's for OCing and performance, then I would go with GB over Froyo. I had a stable overclock at 1.3ghz and stock GB feels much zippier. I consistently get Quads in the mid 1800s and have gotten over 1900 numerous times. By comparison, my Quads on 1.3ghz Froyo were no higher than 1750. I know it's not an ideal way to compare, but it gives you an idea. I tried the pre-rooted GB and while I got as high as 2375, it wasn't worth the extra heat generated and it also felt less stable than the unrooted GB. You can always sbf back using that new sbf method if you don't like it. Just my .02 and I hope that helps.
Swyped from my DROIDX using DroidForums while doing a #2.