What is the best train or bus route between thun and Gruyeres Switzerland. I have checked SBB but they provide many options. I'm confused!
In general it's best to go with the journey which requires the least amount of changes. So if it were me I would go with the Thun-Fribourg-Bulle-Gruyere/train-bus-train combo. The train from Bulle to Gruyere is only a five minute ride.
If you like mountain scenery, take the famous Golden Pass route through Zweisimmen and Montbovon. If you just want to get A to B ASAP, take the low land route through Bern and Fribourg.