Just wanted to add to this subject.
You see, I love the NA vs Turbo idea.
The RGT is perfect for this disscussion.
There are some great differences already mentioned and for the sake of speed I will not repeat those points.
However, one thing I think no one mentioned is engine note.

I love a fully NA tuned rgt.
Not another tuned road car in the game like it. 👍
Btw, another important factor in picking between turbo and na is the level of tuning you want to go with.
If you want to hit a certain pwr, or if you just want to keep a car with-in its limits, the NA tuning can be your best bet.
Anyway, good question. 👍