I taught and studied from various editions of Thomas, for close to 40 years, starting from maybe the second or third, and up through the 9th, 10th and later versions after Thomas himself had died. From this experience I would not recoomend any editions bearing the names of Haas and Weir, although the 9th edition with Finney seemed nice. Thus I would recommend only editions up through the 9th, preferably much earlier ones from the 1950's and 1960's.
To answer the question posed about the difference between the two 11th editions linked, it is obvious from the description on amazon that one of them includes a "media package" i.e. probably some cd's, that the other one lacks. Of course the old ones I recommend will not have media packages, but will be of higher intellectual quality.
In my opinion, the last "classic" Thomas edition was the one from roughly 1957, sometimes republished later as the "alternate" edition. As usual, the best approach is to visit a university library and browse the various editions they stock, and choose the one you like. You may hate the ones I recommend, especially if you are someone who wants media packages with your books.
I cannot actually search the 11th edition online and it is possible since it has a new title "Thomas' Calculus", that it is a republication of an earlier edition I would like. Though I doubt it, since they claim to have rewritten it extensively, which is bad news for an early edition. The editions I liked least I think were called "University Calculus" by Thomas, Weir, Haas.