I tested two leading rearview radar lights – and the winner offers better performance for less money | BikeRadar
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www.bikeradar.com/features/tech/versus/garmin-v…
Can Wahoo's Element Trackr Radar beat the Garmin Varia RTL515 in our rearview radar lights head-to-head test?
Poeng Link
These two are the only ones with high enough reliability, last time I researched 6 months ago.
This guy does in depth videos with head-to-head, on-bike testing. GPLama.
https://www.youtube.com/watch?v=zpcNuEycF9c
This squares with other reviews I’ve seen: Everyone seems to say Varia is the way to go.