i think there is no sigma 10-22, i presume you are refering to sigma 10-20.
of all the 3 wide angle lens, you can narrow down the choice to canon or tokina as sigma 10-22 is only average. Tokina, on the other hand, is well know for its F2.8, but do you really need a fast lens for landscape, only you can answer this question. For me, i usually set to F8-F11 for landscape, so i do not need fast lens. Both sigma and tokina are 3rd party lens, hence possible of front and back focusing problem.
Canon 10-22 has nice colour, great sharpness and well control flare and distortion. 22mm on crop is like 35mm for full format, hence it is also very good as a general lens too. Hence, Canon is my choice.