Oct 17, 2015 - 6:59 AM
Hi Anna 98, thanks for joining MySwissAlps!
Which pass is best, depends on all details of your journey. Will you be using public transportation intensively during your stay? Do you plan to make long and expensive day trips from Chur and Pontresina (I assume that's what you mean?) or are short local trips your main focus? Is unlimited, ticketless traveling important to you? You may check the tips, rail pass overview and calculation sheet at myswissalps.com/train/ ticketspasses/practica l/chooserailpass to find out which pass suits your needs best.
With the information you've provided now, I suggest you at least look into the Swiss Transfer Ticket Combi (providing free inbound and outbound trips and a 50% discount on further trips) and the Swiss Travel Pass Flex Combi (providing a couple of days of free traveling and a 50% discount on trips made on other days in between).
Does this get you started?