Well, it depends on how you look at it:
If you mean which unit is a better unit in combat, that would be the hornet. A hornet would beat a banshee every time.
If you mean which unit is better strategically (sp) then I would have to say the banshee. Banshees are cheaper than hornets, they can be made at tech 1, and they have a boost ability, making them great for harassing. They also get sacrafice, which makes them much more efficient vs. ground units.
Im Allhere:
Nocbl2:
"Oh, hey, that saggy old cripple is too fast. Lets screw him over in a month."
his chair ran low on batteries from zooming around all day long.