David,
First off, I wouldn't waste any time thinking about which kit to build.
I'd grab all three kits, bring them home and hide them from other model intruders.
You have three great kits there!
I built two of them.
Sure, the Waco is a much better looking airplane and would be the first choice. That one is probably the 1/7 scale model. The other Waco offered by Pica was at 1/5 scale. I built and still have the 1/7 scale Waco.
The Stearman is a fine model but certainly falls short in appearance compared to the Waco.
The Beech can be hidden for a while. Still a great looking and popular model.
Here's my Waco as it looks today.
Charles