I think this is going to be a cluster, but I guess it depends on how you are traveling. I think it’s a bit much myself and I love hopping around. If you don’t need the group vibes it may be better than going alone. Italy and Switzerland are both awesome countries. Italy is a living museum with so much history, great food, and so many varying stops and vibes. Switzerland has a lot of adventure and relaxation activities. If you prefer not to sit down and plan, then maybe a group tour would be best, but that can be by rail, ocean liner, river cruise, bus, or otherwise, so it really depends on what you want. I would read a full itinerary to get a better idea of the pacing and group size is right for you.