I haven't handled a 911 but I love putting that Rodent 9 to use! The handle suits me well, especially with gloves, and I appreciate how well balanced it is:
If the SYKCO 911 is the R9 blade with the slimmed tang and light ResC, I'm not sure where it will balance... The R9 is very comfortable to choke-up due to the chamferred choil and spine + slanted transition from scales to blade. I cut similar slants into my SYKCO 511 for increased comfort, not sure if others have made similar modifications of 911's or Dog Fathers or Battle Rats or Busse basics, etc.
That said, the 911 should be lighter, ~15 oz vs the R9's ~23 oz, the Res-C should be a better shock absorber, and Res-C is certainly warmer in cold weather! But I prefer the looks/style of the Rodent 9. Perhaps one day I'll wrap the handle in "ranger bands". *shrug*