I suspect that other planes would be better if I had known then what I know now about getting non C*x engines to run right, but the very best flying 1/2A I have had is the Hunter Stunter from RSM. I am currently working on a model called the Sky Sport, and it has been accepted for publication in Flying Models. It hasn't reached its potential yet, due to more prop and engine combination experimentation.
Others that have been contenders are the Brodak Baby Clown, my own Skyfire .05 (Model Aviation, Feb 2002), and Baby Magician, as published in Flying Models, Jan 2000.
Other probable winners are the RSM Pinto, the Brodak Baby Flite Streak, Minnesota Modeler's Lil Axe and Snapper.
Built right, with the correct engine/prop/lines, all of the above can do a respectable competition pattern.