Tokina 11-16 is a better lens than the Sigma 10-20. Especially where build quality is concerned.
Is your camera a full-frame or cropped sensor? If full-frame you probably don’t need to go as wide as either of those though.
Er…. what are you talking about?
He’s got a Rebel so it won’t be a full frame, not that either the Sigma or the Tokina would fit on a full frame anyway.
Tokina regarded sharper but not as wide (or as long). 1mm makes a big difference at the wide end.
Both built like brick sh*thouses!
Don’t think you’ll be unhappy with the build of the 10-20 at all, especially compared to the Canon 10-22 (i’ve had both and kept the sigma, the canon feels plasticky in comparison).
Tokina considered noisy and slower (not important on an ultrawide).
Sigma fast and silent (HSM).
Tokina has an f/2.8 max aperture.
Definitely wouldn’t say the sigma is poorly built though, it feels like a brick and all the tolerances are tight, at least on mine anyway.
If you like compressed landscapes and aren’t bothered about going “ultra wide” then the 24-105 f/4L is a nice lens, it’s got IS which is a good touch.
Or the 17-40L? Again not as wide but slightly better length and weather sealed. L lenses are pretty tough.