what's the difference between the two of these. The one in my account says classic and haz no store front, the one with a store front says plain Fallout.

Beyong the fact that fallout comes with Daggerfall and arena, and the classic didn't what else has changed?

The "new" fallout games here, have less extras than when they were owned by Interplay.
I heard that Bethesda removed some logos from the game, and resolution patch is installed automatically.
Nothing that you couldn't do in 5 minutes going to a fan site, like NMA, so no big deal.