Like others have said, you should have no trouble selling a small BG-42. Personally, I never had experience with it but from what I can gather, S30V and S35V are step up in terms of performance. Though I can't argue the original "regular" sebenza's are IMHO the most beautiful hard use folder design ever, the Sebenza 25 does have some stark advantages. These stark advantages are so strong that I have yet to find a 3.5" folder which can hang with it in terms of combination of quality, ergonomics, weight, and carrying ability. I have narrowed it down to 3 and 3. 3 advantages and 3 disadvantages. Most all are subjective so take what you will and compare them to your personal preferences in a folder. Here they are.....
Sebenza 25 is King-
Disadvantages - 1. The pivot. Prefer the same size pivot to match the handle hardware and simplify disassembly
2. The bushings. The regular and Sebenza 21 bushing system is proven and perfect, why change what works so well?
3. The blade thickness and handle thickness. The regular and Sebenza 21 have the perfect thickness for a 3.5" folder to minimize weight, improve strength, and easiest cutting ability.
Advantages - 1. The ergonomics. In short, it is the most comfortable in-hand design of any folder for most medium sized hands.
2. The ceramic ball. This little ingenious invention took smoothness to a new level in the action department that bests any other frame lock folder.
3. The blade grind. This new grind all in itself combines the strength of a flat grind with slicing tendency of a hollow grind. Even though the blade stock is thicker, the knife cuts even better.