First of all... don't even bother comparing the two knives because the first you listed is a double action, it goes back into the handle with the slide of the switch; whereas the second is a single action... you have to release the lock and pull the blade back into the handle. This means that they use different mechanisms, and that they are COMPLETELY different knives. I personally am saving for a HIGH quality double action (D/A) OTF that will be more than just a letter opener, if you want to look through those, make sure that on Bladeplay.com or whatever site you decide to buy from, that you click on Double Action OTF knives. If you don't care about having to pull the blade back in with a tab (a single action OTF knife), you might want to consider spending a little bit more and going with something better, the Schrade assisted open OTF knives have gotten good reviews, but if you're set on having a slide trigger, and don't care too much about how long it will last, I would go with The Dart that you listed. Just know that the actual knife that it is modeled after (The Dalton Cupid) can be found on amazon or similar sites for under $200US. Another GREAT OTF knife that is reliable and relatively cheap is the Paragon (formerly Asheville Steel) ATKO which can range from about $170 to about $230 US. My suggestion would be to save your money and buy a good double action one, unless the whole point of you buying one is to simply have an OTF knife.