What are the main differences between the Canon 17-40 and the Canon 24-105 lenses, and which one would be a better choice for general photography purposes?

The main differences between the Canon 17-40 and the Canon 24-105 lenses are their focal lengths and maximum apertures. The Canon 17-40 has a wider focal range of 17-40mm and a maximum aperture of f/4, while the Canon 24-105 has a longer focal range of 24-105mm and a variable maximum aperture of f/4-5.6.

For general Photography purposes, the Canon 24-105 lens would be a better choice due to its versatile focal range that allows for both wide-angle and telephoto shots. The longer focal length also provides more flexibility in capturing different types of scenes.