When it comes to Canon DSLR’s you have two clear cut options for choosing wide angle lenses. One provides great value with good picture quality, another a little expensive but optimal optics, fast and superb build quality.
Canon EF-S 10-18mm f/4.5-5.6 IS STM – $279.99
For your various shooting requirements a General purpose lens wont always make the cut for all situations so a Wide angle lens will be required sooner or later when your General purpose lens cant meet your requirements. If you have a Canon DSLR then there is no other Wide angle lens to start with other than the Canon EF-S 10-18mm f/4.5-5.6 IS STM . This lens provides good value for money and might also be a reason to go for a Canon DSLR instead of a Nikon DSLR because the cost of a Wide angle lens made by Nikon which is the AF-S DX NIKKOR 10-24mm F3.5-4.5G ED is almost $900 whereas this Canon lens is priced at around $280 which is not even half the price of the Nikon lens so if your still on the fence on choosing your next DSLR you should definitely take this into account as you will pay less for Wide angle with Canon.
Canon EF-S 10-22mm f/3.5-4.5 USM
So you want better build quality, better optics and a higher zoom range then this lens is the perfect choice and it is still less than the price of the wide angle lens provided by Nikon. This lens also has faster optics with maximum aperture of f 3.5 as compared to f4.5 which you will get with Canon EF-S 10-18mm which means better pictures in low light and the extra zoom range will also give you more reach to work with which is always welcome.