i used the GC 0.84 SB and found it extremely smooth but a little too mild for me. The JAWS or the OC are pretty close to what i hear in terms of efficiency with the OC a touch more smooth than the JAWS (just a touch). I dont have a OC but have the JAWS and absolutely love it.
You decision will really depend on your hair type. I have lots (and lots) of dark coarse hair and need an efficient razor to get to my daily requirement of achieving BBS. A mild razor just doesnt take me there. I also have a 6C and mainly use plate 6. The JAWS is so much more efficient than plate 6 and quite smooth and comfy when paired with my favorite blade, the polsilver.
If you dont have that much hair to shave of you probably better of with the SB, if you have an abundance as i do the JAWS or OC is the one.
maybe
@Holiday can chime in with his thoughts on his JAWS