I do find the size factor of the Garmin to be quite interesting compared to the briefcase-sized Labradar.
Having one already, I will stick to the Labradar simply for the external power source vs integrated rechargeable battery. My experience is that rechargeables eventually lose durability over time and run time becomes affected. I can always change my battery pack on the Labradar, which I pack along in the carry bag accesory pocket, along with pen and notepad.
If the Garmin can be run while connected to an external battery pack, that may make a very big difference for a lot of people! It fits in the rifle case or range bag, where the Labradar is a beast of its own.