I seen both Hellsing and Black Blood Brothers. Hellsing was a pretty god series, haven't seen Ultimate yet though so I can't say which is better.
Black Blood Brothers... Ok, I was into the series. Key word, WAS. But that series pissed me off in the end. It left far too many questions unanswered at the end of the series, and left far too much to be desired.
"It's not so much as preventing insanity... As much as it is taking advantage of Insanity..."
[This is where I'd put one of my drawings I worked hard on in my sig, but since I'd have to spring five bucks to do so, I'll just put me photobucket link here.]