It all depends on what kinda of driver you are seriously. The OS V-Spec is an awesome motor so far. But NO ONE Knows how long its gonna last yet. It still has yet to prove itself. And it doesnt have a good track record to date. (VZB). However from what I know from mine, Its a bad-arse motor with tons of bottom end and decent rpms as well. If your a "blipper" and from those two, go for the V-Spec. You'll like the grunt.

If your more of a smooth type driver. Linear, and you make room to find speed on the track. The WS7II is gonna be a great motor for that. it lacks the bottom end a bit. But makes up for it with its violent midrange-top end power. I ran the OS-T2050 on my V-Spec. Great.

I run the RB 9886 with Long Header on the WS7II. Great as well.