I feel that you really cant compare the two (spin-tires and mud-runner are essentially the same game so i'm combining them into one entity) they go for entirely different game-play styles and that kind-of why I absolutely despises snow-runner, it feels wrong to me, i guess it could be the new developer its under but it feels too complicated.

Requires higher-performing hardware, largest overall game size.More expensive, especially considering the 'Year Passes'.Maps up to 4x larger than MudRunner/SpinTires.24 maps (including DLCs), all based on real-world locations.63 vehicles (including DLCs), all licensed.Russian and American trucks have the same addons.Nice and colorful during the day but quite dark at night.The spiritual successor to MudRunner, but many components (including the physics and the winch mechanics, among others) have been substantially changed (the physics in particular have been judged as being far more arcade-like than MudRunner).Can run on quite low-grade hardware, low overall game size.Goes on sale for a really good price every now and then (I got it and the only paid DLC for just $7.49!).Russian and American trucks have different addons.Lighting is rather dull but still looks quite good.The successor to SpinTires, essentially SpinTires 2.0 (and has several improvements).Having only played MudRunner, I can't give my personal experiences for ST/SR, but here's a quick breakdown of some of the features of each game (excluding mods):

Spintires mudrunner vehicle list