This isn't even remotely a close call. I love these kinds of rides, and have ridden many, including Kali River and GRR. I was mightily impressed with GRR, and equally unimpressed with KRR. The only raft ride I've ridden that comes close to GRR in terms of length, excitement, and theming, though the themings couldn't be more different if they tried, is Pluto's Bilge Rafts at IOA. That one is wetter than GRR, but I prefer GRR's very well done theming. I respect and like that they didn't redo Splash Mountain with lots of characters, but kept it pure. I also was very impressed with the ride technology inasmuch as, unlike other raft rides, they seem to have found a way to "rock the boat" if you will, on GRR, keeping the raft constantly spinning about this way and that. Very entertaining, as you can't quite predict who's gonna get it when encountering the wetter features, as you can on most other such rides.
As for KRR, ::sigh:: what a disappointment! VERY short for one thing; only one drop, smaller than GRR, a barely thought out storyline that essentially encompasses one scene area, and that's it. I don't know what their decision making process was, but whichever bean counter suggested they spend more $$ on the line area, nicely themed btw, and less on the length and features of the ride, should be placed in charge of the new spinning rides and other "off the rack" attractions.
All in all they got GRR right. Great centerpiece for DCA, and a great ride to boot!!
"Oh, It's a jolly holiday with Disney
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Disneyland '70, '73, '78, '81, '87, '97, Paradise Pier/DCA 1/01
CBR 2/98, PO 2/00, AS Movies 4/01!!