The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 18-135mm F3.5-5.6 IS and the Canon 18-135mm f3.5-5.6 IS STM for their suitability to various photography scenarios:
Size and Weight Comparison
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Canon 18-135mm f3.5-5.6 IS STM weighs 480g, 6% (35g) lighter than the Canon 18-135mm F3.5-5.6 IS's weight of 515g.
Lens Mounts
Both Canon 18-135mm F3.5-5.6 IS and Canon 18-135mm f3.5-5.6 IS STM 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.
Canon 18-135mm F3.5-5.6 IS is also available in Canon EF-S mount.
Focal Range
Both lenses have the same focal range of 18-135mm and the fastest aperture of F3.5 - F5.6.