You're asking if a computer game version of a tabletop game is better than a tabletop version of a tabletop game? Wow, I think the answer there is pretty apparent.
Unless you don't have friends that are into this stuff, buy the game version. Also, I'm pretty sure you can find Blood Bowl for purchase online.
I thought I was pretty clear that I HADN'T played the tabletop version, even offering a pretty good reason.
No, my question was whether or not it stands up to the Amiga version. High Def doesn't necessarily mean High Quality. Try playing Speedball 2 Tournament, for example. It totally ruins the reputation of the Bitmap Brothers original.