I think that either knife would be great. I have both a Spyderco Endura (Old model) and an Older Model extra large Voyager. I love the Spyderco hole, it's easier to use than a thumb stud. That being said, my Voyager clip point is the easiest knife to sharpen to "wicked sharp" standards. The "tanto" point will outlast the Endura if you use the blade in tasks that can cause the tip to break off. The trade off of tanto tip strength, is a tip that is not to user friendly for everyday tasks.
As far as being as smoother to open, both are about the same. Except, the Cold Steel being BIG can flick open much easier. I personally do not like the newer Endura handle (two friends have "lost" their pocket clips) If you realy like the Endura, you can spend a little more cash and get the all metal handle version (awsome knife)The clip system is more secure and the handle shape is like the old Endura ( which I think looks better). Spyderco in my experience makes a better knife across the board, but Cold Steel Voyagers are hard to beat for the money.