Learn a little bit more about the shooting federations here and what the challenge of each sport focuses on. The rules of each sport are not a focus of this as they can change a lot for each these feds, so I'll leave a link to the latest rulebooks at the bottom of each page.
IDPA is large and popular shooting federation in the US that was created to be personal and self-defense oriented and whether or not it accomplishes this goal is a matter for debate. The basic rules of the fed reflect this by requiring things like shooting behind cover and your equipment must be from concealment.
Here are some of my thoughts:
IDPA scores its competitors on a system called "time plus" which means that they take your total time if took to complete a stage and then add all of the penalties that you incurred during a stage. The competitor with the lowest time will win the stage. This scoring system favors a slower pace of shooting because accuracy is slightly more prioritized on the targets that you'll shoot, however, whoever is the fastest and most accurate will always win.
IDPA does not offer as great of a challenge as the other federations because of more choreographed nature of the stages. There are rules that dictate how you have to shoot, for example, shooting must be done from cover, and there is an order that targets have to be engaged from called tactical priority.
However, IDPA still offers trigger time under pressure and against other competitors. This is not the format of match that I prefer but it can still be fun and something to learn from. Even if this style of match doesn't appeal to you I would recommend shooting at least a match or two to build your adaptability as a shooter. A good shooter should be challenging themselves to shoot different divisions, formats, and federations to build their skills and gain a broader perspective on shooting skills.