I have the stopper one and have used it in a hood but it is nice to not have to get the stopper on and off frequently, especially if you have a mix of glass and plastic carboys. If you're using buckets, then the stopper for sure.
Something is always fermenting....
"It's Bahl Hornin'"
Kegged: Sour Saison, Pale Ale, Aggie Ale, Firestone DBA, De Koninck Blonde
Bottled: Belgian Quad (Grand Reserve), Derangement (Belgian Dark Strong)
On Deck: Pliny the Younger