Between the normal GS and S10 I would take the S10, both tubeliss and good service from dealers. And mechanically sound.
The GS Adventure is in my opinion better than both for touring and offroading, big fuel tank and super standard extras.
My dad just had the same delema as he a a BIG Yamaha supporter, but have had good service from BMW so he took the ADV at the end due to the Fuel capacity and having extras from his normal GS that fit.
Get both ....