If you don't really care about accuracy a ton, I would just pick the barrel that looks cooler.

I haven't owned a KAK barrel, but shot a season on my Faxon 14.5 match gunner. That tube seemed to like lighter bullets much more than heavier ones. The only load it was true sub moa for was my 50gr federal varmint. It didn't care for any 77's.

Since Faxon I have tried Rainer and BRT. The rainer was a little gassy, but a laser beam with the 77's. The BRT is my current and looks like a good tube to me.