For 1/10 get the Hudy Startbox - probably the best one I've ever used. (works well with either NT1 or 747/748/750 etc)
https://www.amainhobbies.com/hudy-1-...104400/p155359
For 1/8 get Sworks BB80 (same as Losi red one from 2.0 rtr kits) - I use it on my both buggies and serpent GT cars.
https://www.amainhobbies.com/sworkz-...950001/p274929
Just stay away from xceed boxes... I tried both 1.10 and 1.8 didnt like any bit.