Hello,
We will be spending 20 days in Switzerland. If we buy the Swiss travel pass(15 days) would we need the Bernese Oberland pass? We will be traveling to st Gallen, Liechtenstein, St. Moritz, Zermatt, Bern,Lugano, Lauterbrunnen (4days)
Tirano,etc. we will be taking the Bernina Express and the Gothard express. I'm just listing the areas we're heading to.
I'm casually looking into this myself. Many of the rides and free/reduced entrance attractions overlap between the passes. Grindelwald, Lauterbrunnen, Mürren and Wengen are covered by the Swiss Pass, I think the stops above them require an additional cost.
The Jungfrau Pass: https://www.jungfrau.ch/en-gb/top-of-europe-pass/