FrSky for me, a little bit of clear heatshrink around the V8R4-II receivers toughens them up a bit. For something older like the FF3 that only has PPM/PCM mode then the V8R4-II is your only option in PPM mode. If you are using a 3VC and it has the HRS mode then you can use the TFR4 receiver which comes in the usual plastic case.
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