I am going to have to say LiPo Batteries.
My first car was a gold tub RC10, back then a big stick pack was 1200mah. I switched to nitro over 15 years ago cause I was sick of dealing with batteries all the time.
I just picked up a LiPo charger and LiPo packs, going to toss them in a T4 and give electric a go again. 20 mins of run time and not worrying about annoying the neighbours will enhance my enjoyment of the backyard.