The second shot give a bit better scale since the full-height trees are visible at the top of the falls. That said, there is still some negative space to the top and left. A crop to the yellowish small tree branches on the left and just above the two trees above the falls may be the best compromise.
In the second shot, a tiny bit of fill flash on the nearby trees to the right would have brought some more detail out.
Edit: I went ahead and did it. Also brightened shadows, darkened highlights, added some midtone contrast and ran a wee bit of noise reduction
One thing I always do when struggling with a contrasty scene is convert b&w. In this case I think it is the yellow that is visually pulling you away from the falls.
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