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Generally with engineered flooring, the thicker products don't offer a thicker wear surface but more plys or a thicker core.
Seeing as you are gluing to concrete, you're not too concerned about stuctural strength. The 1/4' product should work for you.
As far as sanding the 1/4 inch floor it depends on who's doing the sanding. I've heard of cases where someone has ruined a brand new 3/4" floor on the first sanding. An experienced floor machanic could sand your 1/4 inch floor at least once possibly twice. The main concern here is flatness of the installation of the floor. If there are high spots in the installation and someone tries to flatten out those high spots, you could go through the top veneer.
The key then is starting with a flat subfloor.
Great point Franklyn! I'll have to add that to the site. If you have any other suggestions....let 'em rip. If I'm not mistaken, most of the Anderson products have a thin wear to begin with?