That current DVD set contains all ten Columbia Keaton shorts, and the prints look great. Better grab it before it's discontinued, folks!
Which are the best of the ten? Definitely the ones where Buster plays opposite Dorothy Appleby, who's very pretty and poised and well-dressed like a 1940's fashion model, but she isn't afraid to get into doing some hard slapstick with him (one of the very few times that Buster is on the receiving end of a pieing in any of his films, it's delivered by Dorothy). Then there's Elsie Ames, who was probably Buster's only female co-star who could match him physically, gag-for-gag, and keep up!
The Educationals, I've seen about half of them (unrestored). Don't expect anything like "The Navigator" or "The General" here, because most of these shorts were made during the era of Buster the Lush, dismissed in disgrace from MGM for excessive drinking and not showing up on the set for filming scenes when he was supposed to. Having said that, Buster's still pretty damn funny even when he's not exactly... knocking himself out, in one way or another.