Depends on the terrain. The Blazer has a shorter wheelbase which will help cut down on getting high-centered. But, the Dodge has more axle clearance due to the taller tires, which will have an advantage in deep thick mud. The weight of the two should be about the same. I am answering this assuming the vehicles are stock as far as gear ratio and horsepower since you didn't include that info.
whats the gear ratio?? suspension? axle rating?engine size?I prefer my 92 yj with 411 front n rear a sm. block 327running on kyb quad setup n my 33X12.5X15 in bf goodrich swamps over both of them.