The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 10-18mm f4.5-5.6 IS STM and the Canon 18-55mm f3.5-5.6 II for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Canon 18-55mm f3.5-5.6 II is the longer of the two lenses at 80mm. The Canon 10-18mm f4.5-5.6 IS STM with a length of 72mm, is 8mm shorter. On the other hand, the Canon 10-18mm f4.5-5.6 IS STM has a larger diameter of 75mm compared to the Canon 18-55mm f3.5-5.6 II's 69mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Canon 18-55mm f3.5-5.6 II weighs 190g, 20% (50g) lighter than the Canon 10-18mm f4.5-5.6 IS STM's weight of 240g.
Filter Threads
The Canon 10-18mm f4.5-5.6 IS STM has a filter size of 67mm whereas the Canon 18-55mm f3.5-5.6 II has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Canon 10-18mm f4.5-5.6 IS STM:
And these are the 58mm filters that we recommend for the Canon 18-55mm f3.5-5.6 II:
Lens Mounts
Both the Canon 10-18mm f4.5-5.6 IS STM and the Canon 18-55mm f3.5-5.6 II has the same Canon EF-S lens mount. Some of the latest released cameras that are compatible with the Canon EF-S lenses are Canon T8i, Canon 90D and Canon SL3.
Focal Range
Canon 10-18mm f4.5-5.6 IS STM has a focal range of 10-18mm and
1.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
16-28.8mm when used on a APS-C / DX format camera.
On the other hand, the Canon 18-55mm f3.5-5.6 II has a focal range of 18-55mm and 3.1X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 28.8-88mm when used on a APS-C / DX format camera.