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Hi Devesh and welcome to MySwissAlps!
To know which pass is the best for your specific itinerary you need to plan out all trips you will make (train, bus, boat, cable car) and compare the prices for regular tickets to the rail pass price (and which routes/mountains are free or discounted). Once you have that information you can read our page here on how to choose the best rail pass. There is a spreadsheet there to help with the math. 🙂
https://www.myswissalp s.com/train/ticketspas ses/practical/choosera ilpass
The Tell Pass covers you on trips around Engelberg and the trip to Interlaken (but not around Interlaken) and does not cover you to Bern from Interlaken.https://www.m yswissalp s.com/tellpass/validit y
I’d guess the Swiss Travel Pass is better for you: https://www.myswissalp s.com/swisstravelpass
But again it depends on your exact trips. Use the link above to do the math to know for sure.