Garmin Xero C1: They're on the street, they work reliably, aiming is easy, data interfacing is easy, battery life is great. Gun mounting is awesome, so we can track velocity live without more stuff on the field. Phone transfer is simple/automated.
LabRadar LX: I've been able to handle 2 of these which buddies have as demo units before the pre-orders ship next month, they're about 3x bigger than the Garmin, and a lot heavier. Aiming is easy, data interfacing is easy, I haven't played long enough to get a sense of battery life.
Caldwell Velociradar: It's vaporware, and has been for multiple years - they re-released the pre-order with a $200 price hike, without actually changing anything about the unit except the color. If they ever do become real, it's too little too late - or maybe, "too big, too late." They're huge, like the same size as the original LabRadars. For the price, the Garmin and the LabRadar are much more compact.
You're probably waiting 3 months to get in line for a LabRadar. It wouldn't be a mistake to wait for an LX, but it wouldn't be a mistake to buy a Garmin C1 now either.
*I currently have a ProChrono Digital, MagnetoSpeed V3, LabRadar, and Garmin C1. I'm going to buy an LX when they hit the market, give my old LabRadar to a buddy, and sell my ProChrono and MagnetoSpeed. Two is one, one is none, so I always want two chronographs, and between my son, wife, and I, we often need more than 1 chronograph on the line, and I like the LX and the C1 a lot.