BG-42 will hold an edge a bit longer, but I like S30V because of its all around properties and go out of my way to get knives in that steel. The way Reeve does it is the best IMO. I will support my claim.
S30V is a bonafide knife steel, American developed and made. It has good edge retention; it is by no means the best and by no means the worst. As you probably know, edge retention isn't everything, especially if a knife is difficult to sharpen or becomes brittle. It also has fantastic impact resistance and overall toughness when hardened correctly, fantastic corrosion resistance, and is easy to sharpen. Reeve's S30V blades are a bit softer than some other blades in S30V, making them exceptionally impact resistant and very easy to sharpen in the field. I have chopped, batoned, and even pried with my Sebs and they do not have any issue.
The Sebenza is a knife that is appropriate for your business class individual who rarely sees a rural environment but wants a classy showpiece. On the other extreme hand, it is prime for your outdoors man who needs a knife capable of withstanding extreme usage and even abuse from cutting to chopping to batoning, to prying to digging. It is also appropriate as a tactical blade. Needless to say, it is a multifaceted knife. The steels and materials used on these knives are capable of withstanding all of these scenarios and any steel ever used on a Seb will perform to the max. With that said, Reeve does not favor edge retention over all other properties, but balances it with toughness which is why a Chris Reeve is both a cutting and a chopping tool, where as many other blades are cutting tools only. A Sebenza will serve you in any and every situation.