xl1 by far but even that sucks monkey ballz i like lrp and novak i use a gt7 or a tc2 in my mission. all you really need for your truck is a novak exploer or a rooster is a nice esc. the xl1 cant handy any low turn motors or any extra cells.
last year rc car action had a stampeed doin 50.8 mph with a 15 turn quad 8 trinity vis matched cells and a rooster esc. if you want i can give you a list of everything that was on the truck
lrp is nice. for a stampeed i would get a rooster becouse they can handle nice monster truck motors 12-15 turns and can handle extra cells or you can run it like i run my clod 12 volts all you need is a reciver pack pack for the reciver and 2 packs wire it up to a keyence zero extreme and bam you got so much power in the truck.