I am getting ready to paint 50+ panels of T111 for a rather large construction project for our non-profit organization. I'd like to spray them but never had good luck with my Wagner. Is Campbell-Hausfield really that much better (in airless designs) or should I just try to borrow a compressor model from someone? Thank you.

Stick with an airless sprayer. Any of the bigger sprayers that can suck the paint from a 5 gallon bucket should do fine. With an air sprayer you will have to thin the paint down too much, and get more overspray. My $179 Wagner Paint Crew has painted a couple houses inside and out, and done an adequate job. Equipment clean up on the airless is more work.