Depends what you need, if you need the 100 mb/s recording and the 4:2:2 color spacing then you'll need the hvx, but if you need the cheap recording to SDHC and the native 24p in 1080p then you'll want the hmc150
also note that both these cameras don't have full 1080p sensors but are rather pixel shifted so they can record 1080p
Oh and also the hmc150 will be sharper...