Nik Wallenda Does It Again — But Which Walk Was More Impressive? [POLL]

I wouldn't attempt either.  

Almost a year to the day of the famous Wallenda Walk over Niagara Falls, Nik Wallenda decided he wanted to walk across the Grand Canyon.

Both seem crazy to me, and I would never attempt either, but what is more impressive -- the walk across Niagara Falls or the one across the Grand Canyon?