If done correctly a tanto encompasses the best of all attributes of a good blade. The addition of a deep belly will make a great slicer, a long curve centerline drop point will make for great piercing and the intercecting edges will provide an excellent razor edge. No other design can incorporate all the right stuff. The spidey tanto doesn't look like it will be the one but it's pretty cool indeed. The tanto design to beat them all is pretty much this diskin.
http://imgur.com/Qa3d7I7
http://imgur.com/Qa3d7I7