I recently saw SASASRT in an local online games store (it said it was coming soon). My question is whether it's worth the extra money (the difference is about 11 euro), and maybe even the extra time I have to wait for the game to arrive, in order to get the CD, or it's just fine to download it on Steam. I mean, I wanted to know if you think there really are some advantages that are worth considering of owning a CD.

I'm also not sure if I will be able to register the game on Steam if I get it from another place.

Get the Steam version.