My American Coach has both air & hyd and I use air 90% of the time. Although at my last rally I had to much slope so I just hit the jacks button and all was well. The air leveling is way faster then jacks and much less stress on the coach too. It is not as firm as jacks but unless your playing football inside it is just fine.
2011 American Coach 42P Tradition
2013 Jeep Wrangler Unlimited