Normally I wouldn't touch a question like this with a twenty-foot wand, magical or otherwise, but since Gip posted it, I will.
Assuming I can have any kit I want and can afford, and that I will scratchbuild any detail not included in the kit:
a 1/16th scale P-38…or maybe a P-51D…or a P-40E…umm…or an F-16…or an A-10…or an A-1H…or a P-47…uh…an F-86…an F4U…an F-89…an F-4????????????????????
After about a month of anxious dithering, I conjure a Level 10 Demon, and put a contract out on the model fairy…
Hey, if you can have a model fairy, I can have a hit demon!
Seriously, I'd have to roll the dice between them, and I'd probably be happy with any of them. (You should see me trying to order at one of my favorite restaurants. I really do roll a die!)
I build solely for enjoyment of the build and the finished product. I think contests are, frankly, a bad idea—our society is overly competitive as it is. But if that's what lights your candle, then enjoy.
Of course, there's the real, secret motive that all of us share: Styrene, in kit form, is more addictive than any other known drug.…
So you can tell the model fairy that she can have my stash when she pries it from my cold, dead fingers. I'm armed, dangerous, and an experienced traveler on the astral planes. I wasn't looking for trouble. I am trouble. And now I'm looking for her! Buuuwahahahahahaha!
Silly enough?