i would personally stick to the 2wd b4.
maintenance is almost zero.
its very very strong.
its quick with even a 7.5 brushless and cheap batteries.
its easy to drive and you dont need to keep changing setups,it works just about everyhere.
parts are cheap and easy to buy should you ever break something.
and driving 2wd will learn you more about throttle control and not going flat out everywhere.
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