Hog's are slow and often cumbersome, because of that they're pretty much stuck-in low. They hunt really well and make great use of their sensory. They're resilient and very dangerous (especially the front end).
Hornet's are quick and nimble, but seem a bit fragile. Agile while low, a hornet also can get high pretty quickly. They pack a pretty good punch, but most effective when grouped in with other attacking hornets.
They are really way too separate to compare unless you're talking super general terms.