pokoko on 11 October 2015
As someone who has recently gone back and rewatched the original Fate/Stay Night series, I don't think it's inferior to Unlimited Bladeworks at all. In fact, the protagonist is far less annoying in the first series and the focus is more on Saber than Archer and it's better for it. Bladeworks really annoyed the hell out of me with the constant masterbation over the main character.
Personally, I'd go with the order of release. Fate/Stay Night - Fate/Zero - Bladeworks. Really, though, you can't go wrong no matter what.
The only real negative is that Fate/Zero is far and away the best of the bunch and raises the bar exceedingly high.
