]So you're saying that people aren't allowed to disagree because it will lead to an argument?[/COLOR] I disagree with that.
I love plain edges. I actually had need of a serrated edge recently on some very tough material at work. I rarely need those serrations, but I didn't lament my plain edge PM2; I also had a Leatherman Wave on my belt that had a handy serrated blade. My point is that it's nice to have them when needed, however at any other time they get in the way. They limit your smooth cutting edge, and make it more difficult to control cuts.
As for your Kabar, I would definitely say plain edge. With something larger than a folder, you want to be able to choke up and use the edge closest to the handle.