Is there a big advantage to running a Pi 3 vs a B? Will FlightAware 3.1 run on a B? I am also running VRS (on a separate server), so does that put a load on it?
The reason for the question is I want to keep my stats at FlightAware.com on the MAC address of the Pi B, if I change to the Pi 3 I will need to spoof MAC address to do that, Right?
A 1B will probably be OK, you may run short on CPU with mlat enabled if you are in a busy area or want to run anything else on the Pi.
A 2B will be fine.