I think my original aversion to the Gumshoe system (or, should I say, GUMSHOE system), was that I thought that having only one dice (and a six-sided dice at that!) would be too simple. And, granted, I haven't run it yet, but I actually think that it's great. I believe the simplicity really just kind of facilitates the storytelling.
But, y'know, you'll probably get very similar experiences with both systems in terms of story. Not to mention how easy it is to convert one to the other. This post doesn't really have a point, just that both are probably enjoyable and the systems work well to facilitate storytelling.