My 2 cents: Just use the lens hood! Naturally, you should take it off for shooting
But rarely in my photographic history did I encounter a situation where the front lens got dirty while shooting. The big mess normally happens while transporting your gear.
And then: If you ruin your uv-filter and don't realize it, you certainly will have a negative impact on pic quality.
This can never happen with the lens hood
Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews
, My Pictures
, My Photography Blog