Hi
Both Draytek would work and draytek have always been rock solid as we use them all the time
We use both as well as other draytek and used in both methods, with some using upto 4 wans and 4G
Personally I would not worry about using draytek with modem (adsl and fftc) and plugging VM as secondary wan, it should work fine and easy to connect to adsl/fttc (there is a wizard if not sure)
You could use weavers choice, but draytek are cheaper the firebox - however draytek will not bond, just load balance/failover
Many thanks
John