As a collector, the "giant Carny" Sifu will fairly rare, but I don't know if that'll translate to cash value.
The good news is that the "choke up" grip available in the original full-groove grip just doesn't feel very good, to me. Some people seem to like it though...more commentary on that is needed because really, that's one of the main things you'll gain in the original versus the "giant Carny".
I guess if you also rotate a Carny into your carry, switching between that and the new-grip Sifu might be easier in terms of "similar feel".
My main reason for wanting the full-groove original is that I don't want to switch. Once something works, I don't change it on a whim
. Also, if you use a grip style that relaxes the "trigger finger", the original is better...remember, Bob Taylor is FMA-influenced and that's classic "Kali grip".
With all THAT said, it would be very easy to take that new Carny-type grip and put "very mild" fingergrooves in it by sculpting the G10 with a dremel tool and a barrel sanding adapter. WEAR A MASK and do it outdoors, and I'm not talking about fresh grooves so extreme you modify the liners. I'm just talking about "edge sculpting". If you did this, you could create new "mini grooves" that *exactly* match your hands and grip position styles.
Upshot: they're both good knives. If you have an unusual hand size OR prefer grip flexibility (a "rapidly shifting grip style") the new Carny-type is nice plus you could perhaps tune it further. The original a more "rigid" grip and is better if you're "FMA-influenced" and tend to relax the forefinger plus offers that "reach grip" by shifting all fingers back one notch.
I hope Bob Taylor joins the thread, or any Sifu freaks with more training than I've had. All of the above is purely my opinion and I'm NOT very well trained.
Jim