If all you use the ATV for is farm/ranch work then yes, the AWD is fine. Once things get really rough - to where you are actually on 2 wheels because one front tire and one rear tire is completely off the ground then you have to wait for the AWD system to kick in. Better to have all 4 tires under constant power in that situation.
I'm part of a Search and Rescue unit. We have 2 Polaris Rangers (AWD) and an ancient Yamaha Rhino with 4wd/lockers. The old Rhino is what we take when in gnarly terrain in the mountains. No need to keep punching the throttle to get engine braking and all 4 tires are always either pulling or providing braking. The absolute worse part of the Polaris AWD system (on our Rangers) is that going down very steep hills, where the front tires do most of the braking, the AWD system disengages the front drivetrain so the front tires don't hold back at all. The rear tires just slide when engine braking does cut in, making for a dangerous situation as the rear end wants to come around.