Just this last Saturday at Pleasant Hill, MO our table was presented with a chicken leg entry. I gave it pretty high marks, although a couple of the other judges said it tasted too smoky - but it scored pretty nicely overall.
Yep, we have a couple of first walks with them. Felt lucky and usually do thights though. We have also seen some other teams doing them but you do not know what was turned in that scored well.
Legs aren't that uncommon -- I'll see them several times in a season. They are, however, less forgiving of overcooking and you can't trim out the tendons without altering the appearance quite a bit. Thighs trim easily and more uniformly.
My first contest...I have only done 4...I turned in 3 thighs and 3 legs. had 3 good scores and 3 ok scores. I dunno which ones scored higher. I have since only turned in thighs and have been pleased with results. I have judged a few contests and will hear judges talking about how they would like to see something different. My feeling is that if I give them something different they wont like it.