I tend to prefer race grade brands which already include all the upgrades, yes they will be more expensive up front but you won't have to deal with design flaws and dated technology which yield performance/handling issues.
There are only 2 brands of 4WD Mini Trucks that I would consider:
PR...
Live and learn, I have grown to appreciate higher quality brands and I no longer support Traxxas for reasons explained here:
Why I have chosen to Boycott Traxxas
Traxxas has intentionally designed their cars to be money pits, but don't take my word on it, here's the main reason why hobby shops choose to push lower quality products for higher prices...