I've been using BTWB for over 6 years now, and I think it's great. There's many free tracks, but you can also request to join any of the gyms listed, many of those are free as well. Our box, www.crossfitoptimize.com
(WFS), uses wodify, and I've been there over a year. Personally, I kept my BTWB membership as a solo crossfitter because I don't like wodify's interface, particularly for logging workouts other than the prescribed wod.