I really depends on when you want it to represent. Also, there are only really 2 kits; Revell's is just a reboxed Italeri kit.
The Revell/Italeri model is a post WWII version built on a Zil 151 chassis. This version was used extensively in the Middle East.
The ICM one is a late WWII version built on a lend/lease Studabaker US6 chassis.
I believe Alan/Eastern Express also does an early WWII version on a GAZ AA truck chassis with wooden cab.
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