Plain, plain, plain for me.
If it's sharp enough I don't need serrated. I just sharpen the thing when it needs it.
But get what suits YOU... not me.
I'm working on picking out a new EDC, and right now I'm trying a Buck Vantage Select (see pic at
http://www.knifeworks.com/buckvantage-selectblackglassreinforcednylonplainedge.aspx - not where I got mine, just the first link I found).
I don't have to impress anyone withe the knife I carry. I don't care for pocket knives that cost a whole lot of $$$, if I have to wreck one in a pinch or lose one, I'd as soon not regret it overmuch. It's just a few inches of sharp steel, it doesn't need to cost $100/inch to be useful to me.
I want a good workaday folding knife (fixed blades are frowned on in NC), big enough but not too big, easy to open with one hand- if it takes two hands to close it I don't mind that too much. Main thing is that it have a useful blade shape (some belly and a good sharp point), be comfortable to carry and use, that it take and hold a good edge and that whatever blade locking system it has be reliable. When I find one I like I'll get two, as I usually carry one on each side. The Vantage design offers three different blade steels and handle materials (420HC in black glass reinforced nylon in the Select, 13C26 Sandvik in charcoal Dymondwood in the Avid and S30V in black G10 in the Pro) so I can have some choice in those areas, if I like the overall design.
lpl