Tough call, I think. If I was going to play Nutnfancy for a moment and try to categorize knives by "philosophy of use," it seems to me that the whole point of a folding knife is to provide as much of the utility value (that is, cutting capabilities) as a fixed blade in a pocket-friendly format, and that the Sebenza line is a successful attempt to do this at a high level of quality. Sure, there are other folding knives from other manufacturers that also offer this, but as with performance cars or boutique guitars, the name carries with it the expectation of that high quality, where as other brands (ZT, Benchmade, Spyderco) offer some excellent knives but also some less expensive models with more modest specs. There isn't a "budget line" Sebenza, or (assuming you buy the version that meets your needs) a less capable Sebenza. Still, it is a folding knife meant to cover as many bases as the format allows.
Meanwhile, far more fixed blades are purpose-built. Just look at hunting knives, and all the specialized styles, each suited to a particular role. Same with dive knives, which is a more narrow focus. Assuming the best possible materials for the intended role are used, within those niches, there are going to be "best" knives in each. Now, if you were to try to choose a fixed blade that covers as much ground as possible rather than one built with a singular task in mind, you would get a lot closer to finding the equivalent of a "best" folding knife . . . but I sure don't know what it would be.