I don't have anywhere near the amount of technical knowledge as the people on the forum. But, I can offer a fresh perspective as I just purchased both in the last week without ever holding or seeing one in person.
Both are solid knives. The CRK (large 21) actually feels slightly heavier than the SMF but when you open the blade the balance is much better on the CRK so the weight feels good. The SMF is definitely blade heavy when opened.
I like the SMF's shape. It allows for multiple grip styles and feels really good when you choke up on it.
The gimping on the CRK is ever so slightly more textured/aggressive but I still feel like my hand could potentially slide because of the thin design (the starburst pattern on mine actually holds the hand pretty good). The gimping on the SMF seems more stylish than functional but because of the countoured handle shape my hand feels planted firmly.
If your looking for a great slicer, the grind on the Sebenza is thinner and lends to a easier fine cut. The blade shape and grind on the SMF screams "abuse me, I like it".
The lockbar is much easier to disengage on the CRK because of the recess in the scale.
The action is smoother on the CRK but quicker on the SMF.
If you like flicking open, both knives are perfectly able to but the strider is easier to do (until you get used to the Sebenza flick). With that said, I really dislike the shape of the thumb hole on the strider. I wish it was just a little wider.
In looks department the CRK is a classy look that is all about utility. The strider is a look that I think you will either love or hate. Its a very aggressive style that demands attention while the CRK doesn't demand attention, it draws your attention (if that makes any sense).
The pocket clip on the SMF is a death grip on your jeans. The clip is firm but forgiving on the CRK.
After all that said, I would get a strider first. That way when you get a Sebenza you could appreciate the subtle perfection that could easily be over looked.
Sorry if I rambled, just wanted to give a noobs honest take on the two.