Best of Switzerland or Best of Germany for teens

What are your teens interested in - scenery and hiking opportunities or lots of history? You may want to have them watch some of the RS videos that show portions of these tours. I've been on both and loved them. The Germany tour will provide a lot more opportunities to explore WW2 history, in particular, and Berlin is fascinating - would your teens be interested in that? There's so much to learn about all of it. On the flip side, Switzerland is beautiful with the mountains. I've had more successful trips when my kids were that age when I got them involved in helping decide what they are most interested in seeing and doing.

Another option might be My Way Alpine Europe:
https://www.ricksteves.com/tours/europe/my-way-alpine
The My Way tours give you the structure of the transportation and lodging being arranged with the freedom to tailor activities to your interests.

If you are talking about a RS tour for this year, you might want to look at which tours are still available. At this point, there doesn’t look to be a whole lot of available dates for a party of 4.

There's also Germany, Austria and Switzerland. Whatever you choose, you'll want to book soon.

I think they would really enjoy Switzerland at that age.