Valentine One (aka V1). Hands down the best and farthest distance. Also has directional arrows so you can look where its coming from to see if there is really a cop of if its just interference.
My friend had a escort and then bought a V1, used both at the same time and the V1 would pick stuff up 5-10 seconds faster, and knowing where the radar is coming from is awesome!
Valentine One radar and laser detectors