I am planning a busy trip from France through Germany to Italy, Switzerland, ending in the Netherlands this summer. Two or three nights in each place. Does it make sense to buy Rick‘s snapshot books or the pocket guide or the larger whole country guidebook?
All my guidebooks live on my iPad mini. Some folks use a Kindle. I would never carry that many whole or partial guides from any author.
It depends on the places you are visiting. On the RS guidebook page,
https://store.ricksteves.com/shop/guidebooks
For the guidebook you are interested in, if you expand the ”What’s Included”, it will show what is covered by the guidebook. I’d choose the one(s) that best line up with your destinations.
I also buy the kindle version rather than the actual book.
On that page, under that "What's Included" link, there is another link that is "Is This the Right Book for Me?" that helps address the question. My view is that if you want the detailed info on logistics, "how to", and supporting info, the whole guidebook is best. If you already have hotels booked, and the transportation figured out, you can do with less.