I can honestly say after seeing the two, I found that 'Omega Man' was superior to 'I Am Legend'. It was a better film and I enjoyed it much more.
That said, its like comparing the original 'Gone In 60 Seconds' to the new version, they are really two completely different movies and reflect different eras, but with a common idea.
Legend was a decent apocalyptic story which looked good and was paced nicely, though still dragged at times. It reminded me, for some reason, of
Doragon heddo (2003) .
The 'others' I didn't really like. Too 'familiar' with the standard type of vampire creatures we see way too often. They also looked a bit 'unreal' at times, wether it was the effects or their framing that had that effect in some scenes I don't know. 5/10