I have both , a Tactical Blur and a SOG Flash II TiNi coated blade with an aluminum alloy frame. The Blur was about $20.00 less than the SOG but also has an aluminum alloy frame. The SOG has a lock reminiscent of the old Gerber Bolt Action knife, it's very secure, the Kershaw is a liner lock ( also very secure). The SOG includes a seperate safety.
The A/O of the Kershaw is a bit more positive, and the size is not overbearing , but just enough. I don' t remember if the clip can be moved ( I'm not home) , but I think it's tip down only. The SOG is tip up only but right or left hand adaptable and has a low ride clip ( very nice , you can not see a knife in the pocket). The blade steel is 440A on the blur and I think AUS 8 on the SOG. The Flash II in Aluminum Alloy is and does look more expensive than the Blur, IMO it has a better overall fit and finish too. But the Kershaw at $50.00 is a good knife too. I never handled a Zytel Flash II so I can't really say for sure, but I think I would still buy the SOG II over the Blur, it's just a personal preference, I like the design.