NO AIR,NO AIR,NO AIR you just can not say it enough times.You are always gonna run out of air,none of them are worth a SH*T!With air there is more weight you have to find a place to mount the bottle and most times that place is hard to get too,then you have to run the lines(and they LEAK) after all of that they still draw amps off your battery which is why you brought them in the 1st place.
If you want the Best buy Dedenbear electric a little more $$$ but the best.If you are on a tight budget buy the Dixie electric,that is what most people use and they seem to work.Don't buy into that the electric does not have enough power,believe me they have all you need and more.

PS If it got air its gonna leak!