Here in UK our two most often-seen ones are the common wasp and the German wasp. Hornets are sometimes seen (I saw one once only, at my other house) but are not aggressive. When you look at their wonderful 'paper' houses, made by patiently scraping wood from fences etc, and forming it into quite a large globe, with hexagonal compartments for the grubs, you can't help having respect for them. I've only been stung once, ( like a red-hot needle!) I try to live-and-let-live with Nature.