Neither is *better* but comparing the 2 then:

electric (with 3700 or 4200 NiMh cells) is 35-40+ mins of fun + 1 hours charging...so get 3 packs
nitro is 10 mins of fun + refuelling (if you know what you're doing) + endless frustration because the damn thing won't start again

(I'm biased to eleccy but done both)

Kev