I want to build autosteer Single GPS + panda + IMU

Which firmware we should use in above configuration?

for PCB V2 or Kaupoi:
Autosteer_UDP_v5_6

for Teensy+IMU+GPS
Autosteer_gps_teensy_v5_5 ? (Autosteer.ino and AutosteerPID.ino would be useless?)

Is it only UDP or is also USB version still availiable?