Just got Trail Boss on Monday, so not alot of driving time so far.
Initial impressions: Trail Boss drives much better than ZR2. Interior on Trail Boss much nicer and much more room than ZR2. Seats in Trail Boss are much more comfortable than ZR2.
Gas mileage of trail boss so far has about 1 mpg better than ZR2.
Both trucks look good on exterior. ZR2 does have locking rear and front diff, which is helpful for extreme off-roading.
Trail boss has power sliding rear window, ZR2 has manual sliding window which was a pain while driving.
One disappointment on Trail Boss is the lack of auto-dimming mirror, I am already looking into adding one. I found connector inside of overhead console. Just for a truck that listed over 59k, it should have auto-dimming mirror. For me that is a necessity. Thanks to this forum for giving advice on adding one.
10 speed Transmission huge difference over 8 speed transmission.