what you find is XT is very light in its class (excluding ktm). despite low power output, it is very a agile.

you can cruise at 60~80 mph (depending how windy it is!) and easily get passed 100 (again depending on the wind and your bike control)

I think the S is probable a better fit for you if you do not need the green laning and tackling any inferior tarmac surface thrown at you.

I have not ridden the S but given the wheel & tyre sizes, it would be more suitable to urban riding with a good road holding.

the R is more of an acquired taste in comparison

aprilia pegasus trail is an excellent bike based on XT but with more kit & creature comfort but they are very rare