Both companies are very similar and both are very good. You can't go wrong with either one. I've already been to Costa Rica (with ABD), so I haven't looked at the 2015 itinearies, but they probably have a lot in common. I would just compare the day to day activities and pick the one that you and you family like the best. I can't comment on the Costa Rica trip specifically, but overall I've found the Tauck hotels to be slightly better, even though their trips are usually a bit less expensive. And with ABD you are tipping two guides, but with TB the tour director's gratuity is included. Personally, I think ABD is getting out of hand with their pricing because they know there are people who will pay for the Disney name. But Tauck has been in business for 90 years and they know what they are doing and provide excellent service.