1. Makes a difference of peppering the oil on the bike or plumb it out past the rear tire.
2. Maintenance wise, gurgle-gurgle goes out the filter on the V-twin breather body.
3. Speedaddy has the sight tube so less thread spinning than on the vt.
4. Bulky and many parts is the sd. V-t has those filters at the auto store all day long.
5. More air flow with a small unit is longer hoses. Especially hose under swing and out at the end of the swing arm. Screw the filter... straight race.
6. Short hose that almost drags hitting the ground? Too dirty is the for every action, the dirt goes up the hose. How far can it travel back, I do not have that answer.
7. Without the filter but a hose out to the back of the bike, that vt overfills, you can see it with a clear hose and belch out enough to know to drain the vt collector.