Here is a side by side pic of both of them.
As others have said, the difference only is what you think it is. I personally like my Strider SMF far more. But I just happen to like a beefier more manly looking blade. Some guys USE their Sebenza's. Mine is more of a case queen. My Strider on the other hand does get used. It to seems need scars to make it look cooler. And do I enjoy using it.
I do like to flick my knives. The Sebenza has more of a clinical/pneumatic feel when flicking and has an unsatisfying "tink" when it snaps open. The SMF however has a very nice kur-thunk kind of flick to it. It is just a much beefier blade and it is oh so satisfying.
Others have said the Sebenza slices better. But it doesn't. Both of these knives will easily slice through telephone book paper. That very long thin flat grind on the SMF makes it very adept at slicing. Even apples. And the large choil on the SMF lets you really choke up on it for fine tune cutting also.
Which is more reliable? The Sebenza. No doubt about it. What kind of motorcycle would I buy a Honda vs. a Ducati?? Ducati hands down. But more people buy Honda's. It's the exact same dynamic here.
My only recommendation here to you, is to buy one of each. Play with and hold them for a few days (do not scratch them) and then send the loser back to the dealer. PlazaCutlery.com and Knifeart.com both offer both brands. Maybe you could just be upfront with them and say what your intentions are.
But for me, when you look at my avatar picture, the Strider SMF is on top for a reason.