I voted 21st Century Coverite fabric because that's what I've used with great success. You'll hear all different opinions.

I'm getting ready to cover a plane. For this one I'll be going with LiteFAB from Nelson Hobby. www.nelsonhobby.com

I've used Nelson water-based paint in the past, a great product. Jerry Nelson does everything right for both RC and full scale aviation and I'm looking forward to trying what he brands as LiteFAB.