The fit of an S and SCG is exactly the same for the rider, except for the seat. Your hands and feet will be at the same position. You can fit the S or taller seats to the scg if you like.
The scg suspension is lower. The ride is harsh, the muffler will bottom out on things like curbs or speed bumps. You could swap it to S suspension pretty inexpensively.
The bigger issue is the maintenance. Often, most low mileage bikes have not had any maintenance done to them and a long list is due because of age. The youngest of these bikes is 10 years old.
There is a men and motors review of an S out there by a tall guy and you can see how ridiculous he looks on the tiny bike. Resident forum star “Cooter” is tall and also looks ridiculous, but that’s another story