which is best combo for...
 

First one is a (vintage) 1/10th scale Tamiya TL-01 all wheel drive car with full bearings and carbon main shaft. This is for my son who is going to be 10 years old and has already 6 years of experience with RC.

Second one would be his (vintage) little 1/18 scale Losi Mini T two wheel drive stadium truck.

This is for playing, not racing but he likes it when the cars and trucks are fast.

I looked at the products and I'm not quite sure which ones to get plus everything seems to be out of stock.

Thanks
Ray

Any brushless system will shred the drivetrain of that old tamiya, the mini-t might hold up or have modern replacements.