I guess the only way to tell for sure would be to take out the switch and look at the back, but the driver you mentioned is for the Red Series Dimmer (LZW31-SN). If Hubitat matched the device with this driver on pairing, that is likely it. If you have a long LED bar on the right side of the switch and the commands to use it for "notifications" (effects) works, that is certainly it.
Inovelli sometimes refers to these as "gen 2," with their original procuts like the NZW31 and NZW31-S being referred to as "gen 1." There are not (currently?) multiple generations of the Red Series, a term that was first used when these products were introduced.
As for the driver, whichever meets your needs! Inovelli's custom driver (and others) offer more features, like a way to generate events for all taps up to the 5 the device supports, whereas Hubitat's will max out at double taps. You can switch drivers to test things out if you want, though you'll probably want to decide before you automate too much, as they generate button events differently.