I have the Canon 10-22 and use it quite a bit, more than any other lens for landscape. I haven't tried the Sigma or Tamron, but I've heard the image quality isn't as good.
I did a quick look at some of my Antelope Canyon shots and I found almost all were at 10mm or close to that; I was shooting with a T2i (1.6 crop factor), especially in Lower Antelope which can get quite a bit tighter than Upper. Sometimes I did a few shots with a 24-105, but only once, because I was so worried about the dust being blown into the canyon. Next time I'll take two bodies with different lenses.
For some perspective, here's one of my shots of Horsehoe Bend at 10mm. I was very glad for the wide angle here; you can't really stand further back and still include river, and even with 10mm I cut off the river and still keep as much of the sky I wanted in the shot. Later, I thought about stitching but by then that was too late. I also may not have picked the best ledge to photograph from, but I felt decently safe on that one lol.
EDIT -Sorry, had to shrink the file a lot to fit within forum limits
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