Asking what’s best typically just spars the Chevy vs Ford debate since everyone has preferences that may be based on experience or just on hearsay.
A SIG Astro Hog
http://www.sigmfg.com/IndexText/SIGRC55.html is an older design that has a lot of parts to sand and carve
The GP Super Sportster 60
http://www3.omnimodels.com/cgi-bin/w...I=GPMA0210&P=0 will be more challenging than the trainer but still pretty basic construction.
Their Corsair 40
http://www3.omnimodels.com/cgi-bin/w...I=GPMA0177&P=0 is a non-scale model that has a challenging inverted gull wing
Top Flite Elder 40
http://www3.omnimodels.com/cgi-bin/w...I=TOPA0215&P=0 has exposed trusswork that shows off the fit of the joints
You can see the manuals to all of these online to get an idea of what’s involved in the build.
Look at as many online manuals as you can. You may decide that one of the Top Flite scale models is perfect for you. They have good instructions and enough have been built that getting answers to questions should be pretty easy.