We did Tauck for Alaska in 2018 (our kids were only 10 & 8 at the time but loved it). At that time we had not done any ABD trips but have since done 2. I would say they were are highly comparable with the one caveat that Tauck uses one guide instead of 2. They also seemed more "flexible" about things. You went to dinner at any time at the hotel restaurants for instance and ordered whatever you wanted off the menu (including alcohol). Not many "dinners on your own" but that may be because it was Alaska and not many options at various places but the on your own was really any time you wanted. We would not hesitate to do Tauck again if the itinerary was better than ABD.