I fail to see where the fact that the knife has a liner lock is going to prove to be a liability. I admit that I am one of those who are partial to them. Strider makes some of the finest survival/tactical blades out there. They are designed to be used hard. If there was a serious issue with the reliability of liner locks, I have a strong feeling that Strider Knives would have opted for a different locking system.
I'm certain that A.G. Russel makes fine knives. I've never handled one myself, but everything I have heard about them is positive. As for the choice between the two knives in question, I would opt for the Strider.