There is no comparison. Bioware by a mile.
They single-handedly revived the (western) RPG genre with Baldur's Gate and have continued to follow up with titles such as NWN and KOTOR.
I am also looking forward to Dragon Age.
They do have some blots on their copybook, however (I'm looking at you Icewind Dale).
On the Bethesda side, Elder Scrolls was OK, but nowhere near as immersive (I own and have finished the entire series).







