I love the S90 Version, but the BG42 remains the only one I bought an extra one I loved it so much. I love the edge BG42 takes. It's a very clean, high quality stainless, high speed ball bearing steel.
Ball bearing steels ( example 52100) make good knives due to the carbide structure and cleanlieness. BG42 is one of the few stainless ball bearing steels.
BG42 has always been fairly time consuming to buy with up to one year waiting times for delivery. Apparently the new company has increased the minimum order, increased price, and also increased waiting time, so I've heard.
S90V is also an expensive, super high quality steel, but Crucible is easier for knife companies to work with.
The bottom line is both steels are excellent, but slightly different strengths & weaknesses. I typically say "get both", and in this case there's good reason too do so.
If you can't, get the one that suits you best.
I don't know how much more BG42 will be used for knives. If the PITA factor gets too high, it won't be used much anymore for knives as there are other very high quality, high performance steels available.
It's one of my all time favorites, but so is S90V. Joe