Out of interest, what vehicles do Riegels actually kill that Tellers can't?
It is the other way around:
-The Teller mine does 400 damage (able to oneshot t70, stuart, greyhound and aec and everything below) but only does the light engine crit as posted above.
-The Riegelmine on the other hand does 320 damage (enough to oneshot ultra light vehicles like m3a1, UC and WC51 and halftrack variants: M3, M5, M15, M21 [except m15 at vet3]). The strong point after being doctrinal and tied to the 251 are neither cost (50-50) nor planttime but the stronger immobilze crit that gets pretty useful against high hp Tanks that can get hunted down and can get destroyed from safe distances (both doctrines also offer dive bombs that should finish of medium tanks or have access to either a LeFH or Elefant to punish stationary vehicles)