What are the main differences between the Kreg K4 and K5 pocket hole jigs, and which one would be more suitable for my woodworking projects?

The main differences between the Kreg K4 and K5 pocket hole jigs are that the K5 has an improved clamping mechanism and a built-in drill bit storage. The K5 would be more suitable for woodworking projects due to its enhanced features and ease of use.