They are both great clubs. The smoothie is supposed to be a bit easier to get the ball up off the deck. I have not really found that to be the case. Both ridge top and smoothie are very solid, long hitting, and fairly easy to hit off the tee and from the fairway. I currently have a 13* ridge top which I believe to be the best fairway wood that I have hit.
In terms of what it's worth - the smooth top is better looking in my opinion. Performance is more important however.