Outdoors in slippery conditions 4WD easier. Indoors with loads of grip I'd say harder, more lairy, more tyres, more heat etc. (I do both and I'm still struggling with 4WD indoors!)
But don't be put off! if you're going 4WD personally I'd go with a Yokomo Bmax4 III or an Xray XB4 2015 or 2016. Stronger than B44 and metric.
Good luck whatever you decide!
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