I have compared the 11 150sx with fmf exhaust and sxs head, eg yz144 with fmf exhaust and vforce and a home made stroker YZ144 on the track and dyno.
The big winner was the stroker yz. It had more power everywhere. The SX came second at peak, 2hp less than the stroker, but 1 more than the eg YZ. However, the eg bike had more bottom-mid and more overrev than the sx, so it depends what kind of powerband you prefer.
I prefer the ergos, suspension and handling of the yz. The KTM has powerful brakes, but all the yz needs to catch up is a galfer braided hose.