gtfreight,
The AirChrony is similar to the 'Polish' chrono', but is, IIRC, made in the Czech Republic (?).
The AirChrony uses a USB interface to connect to PC, so is easier that way.
I have not used, or seen in the flesh, the AirChrony, so cannot speak to its qualities.
I do use the AirChrony software to process the PC data dump from my R2 chrono'.
Have fun & a good weekend
Best regards
Russ