I use W %R with the Bollinger Bands, which is VERY similar to the Keltner channels. So my answer would be, use the Keltner.
But don't forget, neither the W % nor the BB (or I guess the Keltner) work in trending markets. Usually days after a big move (consolidation) or before a holiday or FOMC meeting is a good candidate for sideway movements and to use those indicators.
Also, why don't you just watch those indicators (Keltner and Stoch) and see how they behave and recognize repeating patterns? Probably both have tendencies to presignal certain market conditions.
The W %R actually tends to be a bit early, which makes it a perfect indicator to act on....