Educate me on 250 sport quad….

Looking to pick up a sport quad for my 8 y/o son.
I know ZERO things about them..

Thinking either a Raptor 250, or a Honda TRX 250.

What is going to be the better machine?
I see one is shaft driven, and one is chain driven.
Whats the pros and cons?

What is Hondas sport clutch?
The website shows that it is a 5 speed w/ reverse.
But how does it work?

They both a good names, so I would be thinking the reliability would be about the same?

Which one is going to be faster?

He has been riding snowmobiles, dirt bikes, and UTVs his whole life. Driving a clutch is not an issue.
He is probably 51" tall, will this chassis even fit him?

Thanks in advance…