Beyone GWS TM
Hi,
I've got all of GWS TM, GWS Zero and MM Switchback Sport and I'd say that the Switchback was a better step up from the TM than the Zero. I like the Zero but I didn't start to fly it until I had 400+ flights on the Switchback (last 200 with brushless). The problem with the Zero is that it isn't a "beginner" aileron plane but a scale warbird and it suffers from the same foibles that you'd expect from a warbird - a tendency to tip stall at low speed during approach and a tendency to nose over on landing. So if I were you I'd get the SB for the time being - you'll be able to use the kit out of the Zero (even the motor/GB/prop/battery) in it and then put them back when oyu have more confidence.
Cliff