I am unfamiliar with Kenny's ride times, but the app is so affordable why not get it anyway? It's FANTASTIC if you have any interest in characters at all, and it's worth it just for that IMO.
I am a longtime Lines subscriber, too.
I think any/all crowd predictors, etc are struggling right now with attendance up in general and constant curve balls (Like EMM and DAH) being tossed by Disney.
Each app has its strengths. Be aware that Kenny's is not a true app but is web-based.