+1ask yourself what you need from your lens first. If you need a wide aperture, than Tokina 11-16 f2.8, if you want a better range, than Canon 10-22 f3.5-4.5, if you're on a tight budget, then Sigma 10-20 f4-5.6
There's no best lenses, only lenses that best fit your needs. And erm sorry if I got it wrong, but if you didn't understand what I said above (with all the technical terms and all), I suggest reading up about basic photography first before deciding to buy anything
It depends on what you want, again.b/w the Tokina 11-16mm f/2.8 and the Canon 10-22mm f/3.5-4.5, which would u guys choose? It's a pretty hard decision because the tokina has a lower aperture but the canon has a longer range.