I've had maybe six SMF's and they are fine heavy-duty knives. The blade-steel is 0.190" thick, IIRC. A Strider SMF is an excellent choice; primarily developed for military and law-enforcement. It was the first official folding knife of the U.S. Marine Corps in 2003.
The Chris Reeve Umnumzaan (African word for "boss"), with blade-steel thickness 0.140", is the more "tactical" version of the much more numerous Sebenza series. The Umnumzaan model is very similar, in size and design, to the "large" model of the Sebenza series. The word Sebenza is the African word meaning "work." Tolerances are extremely tight on all CRK products and Chris Reeve Knives commonly is awarded the Manufacturers' Award for Excellence...each year at Blade in Atlanta.
I've had two Umnumzaans...and many Sebenzas. My EDC has been an Umnumzaan for an extended period of time, although I have carried the SMF folder on occasion.
Both companies have excellent Customer Service and Repair available to the owner. Prices are approximately the same.
The Strider is generally thought to be more "tactical" in design and function, and perhaps intended for more heavy-duty uses as well...considering its much thicker blade-steel. The Umnumzaan has a more "gentlemanly" appearance, while not lacking in performance.
Blade-steels are similar, in that both companies have favored S30V and S35VN in the past, although Strider seems now to produce the SMF in quite a wide variety of excellent blade-steels.
You would do well to handle both folders and then to decide which is best for your purposes. I cannot fault either knife.
Sonnydaze