I think it's kind of 50/50, at least in my case. The 4wd has alot more moving parts so of course your odds are much greater of something breaking over the 2wd. On the other hand, the 2wd takes more skill to go fast and thus if you don't nail the rythem section just right or get a good drive out of the corner, things are not gonna be pretty, where the 4wd can bail you out sometimes.
I would get a 2wd if durability is your primary concern at this point.
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