Re: Graubunden Pass
speaks of 2 days free travel during a 7 day period or 5 days during a 14 day period, including on the Chur-Bad Ragaz section of the SBB line.
The full Swiss Travel Pass costs more, but would allow you to use it each day during your stay.
On a recent trip, I had a 7 day Pass, but needed to travel on the 8th day and a short trip from Zurich to the Luzern area cost quite a bit. There may also be differences in discounts or services offered on private companies (cable cars, mountain trains, local bus) between local, regional and national passes.
It all depends on how long your stay is going to be. You should also verify where the GraubuendenPass allows use on consecutive days or whether they have to be spaced out as with the Flex Pass.