I doubt any of them are more "accurate" than the others. It comes down to price and features.
If price rules, get a Chrony. For the best combination of features in a current production unit, look at the PACT "Pro". It has seperate sensors, a built-in printer, an excellant statistics program and it prints a useful trajectory chart too.
Pact replacement sensors are, or used to be, the least expensive available but there is no rational reason to be shooting them.