I prefer the look of a hood... an open blade looks rather like an open zipper... No sense in building a nice gun and then "flying low..."
I'm not a fan of winged semi-hoods... they look "blown open" and unintentional... I do like the look of vented hoods, but then there is always the possibility of a twig pushing through when busting brush and torqueing against the blade... not an issue with a steel bead (the twig would be small), but if a fiber optic rod is employed, then it could be damaged. A vented hood with a steel bead (perhaps a tritium or ivory tip) would be the best compromise in 90%+ of situations... the other 10% you make it work... considering that the scope is your primary sighting device, it is unlikely that you will ever have an issue with this set-up.