I've only done 4 ABDs, but more than 6 group family trips, so I'm going to violate the rules of your original post and chime in. Feel free to ignore me if my ABD sample size isn't large enough for you, lol.
The 4 ABDs we have done are:
Scotland - 2013
Austria, Germany & the Czech Republic - 2014
Baltics cruise add on - 2015
Backstage Magic - 2018
The other family group trips we have done (or have planned) are:
China - 2016 with Thomson Family Adventures
Winter Yellowstone - 2017 with Austin Adventures
Peru - 2018 with
Nat Geo
Botswana - 2019 with Natural Habitat Adventures (this one isn't technically a family trip, but the group size is capped at 7 and my teens will make up 2 of the 7 on the trip, so I'm treating this like a family trip)
Japan - 2020 with Thomson Family Adventures
Of the trips listed above, I would rank them in order of my favorites as follows:
1. Scotland ABD - this was our first foray into group travel, and we absolutely loved the experience and the trip. The original Scotland ABD itinerary was so so awesome, and we fell in love with Scotland as much as with the trip or the concept of group travel. Note: we had the pleasure of traveling with
@calypso726 and
@CaliforniaGirl09 on this one

2. China (TFA) - this was such a well-designed trip, and a fantastic experience, and we loved having only 10 people on the trip.
3. Winter Yellowstone (Austin Adventures)
4. Peru (Nat Geo)
5. Backstage Magic - an itinerary that is by definition unique to ABD and so much fun for a Disney fan
6. Austria, Germany & Czech Republic - there was nothing wrong with this trip at all; in fact, we met so many great people on this one that I still keep in touch with. I think it just paled in comparison to Scotland and we were a little put off by having 42 people on this one.
7. Baltics add on - 49 people. Enough said. Also shared this not-so-great experience with
@CaliforniaGirl09.
We obviously haven't done Botswana or Japan yet, but I'm fully expecting Botswana to jump into the top 3 and perhaps finally knock Scotland off as #1!