The fuel impact wrenches have a lot more torque than the non fuel if you're going for the big series. The non fuel big one has 600 ft lb breaking and 450 ft lbs fastening. The small m18 Fuel impact has about that much in a package under half the size. The M18 Fuel big impact has 1400 ft lb breaking and 1000 fastening.
In using ours, I've found that the bigger the battery, the more power it puts out and for longer. I haven't tried the 12 amp batteries yet, but I use a 9 amp. runs like crazy. It's a lot better than the small batteries I had, and I also have access to 4 and 5 amp batteries. The 9 is my go to on the impact.
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