I’m having trouble figuring out what's best!

Swiss Pass, Rail Europe Pass or No Pass?

What is the least expensive way to travel by train from Salzburg to Interlaken, Switzerland and then from Switzerland back to Munich. We (2 of us) will be in Switzerland for about 6 days, mostly in the Interlaken/Lucerne area.
I thank you for any advice you can give us.
Judy
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