The E-Savage and E-Maxx are considered 1/10 scale, however, the e-maxx (no experience with e-savage) is as big as the T-Maxx and both are a little smaller than a Savage. E-Revo is actually a little longer than a nitro Revo.
If you want the biggest and beastliest truck on the block, I'd say go for a Savage with a FLM extended chassis.