I have used the Mamba maxes and personally I prefer the vxl. If I were to build another rustler I would get a mamba max esc, and a vxl motor. the best of both worlds IMO
If you buy the new vxl diff beware that the diff internal gears (planetary gears) are very hard and tend to break the teeth off I broke 3 sets in about 15 total minutes of drive time). I ended up using a set of really old planetary gears (shiny looking steel) and they work fine. Just a heads up in case you have issues.