Going on a trip to Alaska in the next month. I already have a long lens (70-300) picked out, but I am stressing a bit over these two lenses. 
I have read the 16-35 is the way to go, and pickup a prime 50mm to fill the buffer from 35 to 70.
However, some have said that 24 is plenty wide, and having the extra reach to 70 will fill the complete area.
Coming from a crop camera, with crop lenses, I am trying to visualize what I may need or may not need. I have used 10-18 on my 80D, and found I rarely used the 10 and more 14-16. However, that is a crop and this will be a FF so picturing it is a bit tough.
I have read the 16-35 is the way to go, and pickup a prime 50mm to fill the buffer from 35 to 70.
However, some have said that 24 is plenty wide, and having the extra reach to 70 will fill the complete area.
Coming from a crop camera, with crop lenses, I am trying to visualize what I may need or may not need. I have used 10-18 on my 80D, and found I rarely used the 10 and more 14-16. However, that is a crop and this will be a FF so picturing it is a bit tough.