We are booked on an ABD adult only Rhine cruise in October 2025, but we spent a while going back and forth about whether to use ABD or book direct with Ama. I ended up making a spreadsheet comparing the excursions as that and the ABD guides were the biggest differing factors for us. ABD had more excursions (sometimes two in a day vs one) and better ones (although there were a few with Ama direct that I would've preferred). I forget exactly what our price difference was but I think it was around $1000pp. Keeping in mind tipping and transfers, it would actually be slightly less. Also, as mentioned above, Ama direct typically has a much older clientele. We're not spring chickens, but we're still quite active. As said, in the end we decided to go with ABD, but I'm sure you would still have a great trip direct with Ama (in fact we had Disney friends who went direct with Ama who were trying to steer us that direction).