Nhfire77,
Years ago my husband and I always rented a car when traveling in Switzerland. He drove. I navigated. It worked for us. However, for the past 25 years we now purchase some type of Swiss Travel Pass. I agree with Nigel when he pointed out that with a car one person has to concentrate on the road, the other on a map or watching road signs. Neither one can concentrate on the beautiful scenery. We find riding the trains, buses and boats allows both of us to really see and appreciate the beauty that is Switzerland. In addition, the convenience and reliability of public transportation in Switzerland cannot be beat. We recently returned from a 16 day trip to Switzerland.
One aspect of our 15 day Swiss Travel Passes was the spontaneity of our daily plans. For example, one day we traveled from Brienz to Montreux (to see the Freddie Mercury statue--long story). We took a scenic route which took more time. We had planned to take a faster route home, but decided we enjoyed the scenery on the longer route so much we changed our plans. When the train stopped in Interlaken we got off and walked to a favorite restaurant for dinner. After dinner we returned via train to Brienz. We enjoy the flexibility and the fact we don't need to purchase a ticket every time we want to go somewhere. I cannot tell you how many times we rode boats on lakes Leman, Thun, Brienz and Luzern. Just walk on board and the ticket is checked later. Sometimes we stayed on board for two round trips!
You must do what is best for you. This works best for us, allowing us spontaneity, flexibility, and the ability to really appreciate the beauty that is Switzerland.
Happy planning and travels!
Traveler Girl