Omega jade is my personal favorite boar. SOC is a great brush, but doesn't splay as easily as i prefer. I much prefer the lesser backbone of the jade. And it's the only omega handle that isn't serviceable garbage. Ymmv etc
I want to clarify, I actually consider the SoC to be a higher quality brush than the Jade. The highest quality boar i own, in fact. The knot tie, the bristle selection/quality, bristle uniformity and height uniformity are all superior on the SoC. You can tell that they manually picked the best bristles for the SoC, whereas the jade just has random pig hair. The SoC is the superior brush. It's also far more dense.
The only reason I prefer the jade is because it's a bit floppy and I like my boars a bit floppy. In other words, the jade just happens to land exactly on the part of the splay/backbone spectrum that I like. Ymmv etc
If you like medium+ backbone then I recommend the SoC over the jade without hesitation.