Well, as many have said, it depends on your intended use.
brownie made some very good points.
I would definitely go with a combination edge.
BM offers most of its blades in combo plain/serrated, and i think its the best option by far.
I think that fully serrated knives have VERY limited applications, so stay away from those, unless you really need one. (Cutting lots of rope, etc.)
Plain blades definitely will get most any job done, but it is very nice to have the small serration to help out in certain tasks.
Most combo edges only have about 1/4 of the blade serrated, so its not that big a deal to sharpen, nor will it get in the way of anything else.
Plus they look better than just plain edges!!!
Combo all the way!