What Joe said
I started with the home Ramp, but got a Club Ramp after trying out a few workouts. The Club Ramp is a bit bigger in both dimensions and is a bit sturdier. The height adjustment is much nicer.
The main selling point to me was the increased width -- the extra room to travel side-to-side allows me to add more energy to the workouts, so the workouts become more low-intermediate rather than beginner. Once more advanced workouts for the Ramp come out (please??) this may not be as much of a factor.
HTH