Hello. I have the 6S, GC .68 SB and .84 SB. I have to say that I am not a fan of the exposed tabs on the 6S. My habit is to use the .84 after a weekend of no shaving and the .68 for the remainder of the week. I recently ordered the OC and JAWS plates for the .68, thinking I may be able to use one of these options instead of the .84 SB plate, after going a few days without shaving. I might suggest opting for the 6C if you're still on the fence so you can decide if the adjustable blades are of value to you without spending the extra cash for the 6S. I would definitely grab either the GC .68 or GC .84, though. The .68 option of the GC is probably the safer bet unless you know that you like the extra efficiency up front. Put another way, in hind sight, if I could only purchase one, I would grab the GC .68, given my beard and skin sensitivity.
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