Feb 10, 2016 - 4:21 PM
Actually, there are three options. For discount percentages, I'll assume you're most interested in the 15 day Swiss Travel Pass Flex mentioned in your previous post:
1. by train via Lauterbrunnen and Zweilütschinen. This is the valley route. It's entirely covered on a free travel day, but less scenic than the other two. I'd recommend this if weather and views aren't good;
2. via Männlichen. Cable cars from Wengen and to Grindelwald are discounted by 50% during free travel days. The views up there are absolutely beautiful;
3. via Kleine Scheidegg by cog train, discounted by 25% on free travel days. This is a very scenic ride, and the views from Kleine Scheidegg are special as you're literally at the foot of the famous Eiger, Mönch and Jungfrau trio.