Mt Whitney Zone Forums General Discussion Compare Whitney day hike vs Grand Canyon rim-to-rim

I've not done a R2R, but have done the loop down N. Kaibab & up Bright Angel three times as a dayhike. I've done Mt. Whitney as a dayhike about 15 times. Of the two, the above GC loop is easier. Not easy - easier. And, for context - I'm not a superhiker, nor marathoner. Will turn 70 this year, and enjoy hiking.