Unless its a rare or collectable box or disk set I'll take digital everytime. Takes up no space on my bookshelf for a start I used to have racks of them. I was looking for an old game the other day couldn't find the disc anywhere, probably lost in a house move or perhaps in my mum's attic somewhere.
I bought the first 6 original Tomb Raider games in the steam sale lately for 99p each. I got given an old laptop recently so just install the steam client and they're ready to play, something to do while on the train etc. Probably about the only games it will play I've got the original discs lying around somewhere but this is much easier and no need to have discs in the drive for game's CD check, etc.