I use the ag tires, its what came on my b7100 I have no complaints if it is wet & soft it will leave shallow ruts but that is the weight of the tractor not the tires.
I have a G1800 and just bought a set of ag tires. I was a bit disappointed with the ags. I have a gravel driveway that slopes up and down about 7-10 %. The turf tires really grabbed but the ags tended to spin and dig themselves in. I haven't tried the ags in mud, they might be better but in loose or semi-loose gravel the turf tires win out.
