Aug 14, 2019 - 8:07 AM
Hi EMSV, welcome to MySwissAlps!
I think both options can be considered scenic, so it doesn't really matter which one you choose. The Bernian Express is obviously a special experience (www.myswissalps.com/be rninaexpress) and the scenery is absolutely beautiful. Heading for Lauterbrunnen that same day would indeed be a bit ambitious, but if time is no issue you make like an overnight stay in or near St. Moritz (www.myswissalps.com/st moritz) or Chur.
The Brig-Interlaken alternative is very nice too though, especially if you plan some extra time to use the local Lötschberger RegioExpress trains passing Goppenstein/Kandersteg, rather than the quicker tunnel connection between Visp and Spiez. If you'd like to spend most of your available time in Lauterbrunnen, this would be a great option. You'll find all connections in the timetable at www.myswissalps.com/ti metable.
Please find day trip suggestions for the Lauterbrunnen area at www.myswissalps.com/ju ngfrauregion.
Since you plan to spend some days in Switzerland, you're probably best off buying a rail pass: www.myswissalps.com/tr ain/ticketspasses/prac tical/chooserailpass. Depending on which pass you choose, you'll also need additional tickets for (parts) of you inbound and outbound trips from Italy and to Germany: