I've only used BFWD on the hood of one of our cars, but it did feel like it was a little easier to remove. Didn't feel as slick as WGDGPS though to me.
That being said, I love WGDGPS. Extremely glossy, slick, and awesome reflections. Two coats of it easily gets me through August-April, and the truck is outside 24/7.
Here's a good review of the two: Review: Wolfgang vs. Blackfire