I'll add my .02 ...
I'm a long time shooter, having started when I was 6
, and shot USPSA (which is the USA governing body for IPSC, which is the International Body), for several years. I just love it!
I shoot a 1911 in the Single Stack Class and used to shoot Open with a fancy race gun. For me, there's nothing like it!
IPSC evolved from the old days of the 'Leather Slap' competition that Jeff Cooper and the boys held up at Big Bear in the 50's
When Bill Wilson brought IDPA along, I tried it a few times, but I found it wasn't to my liking. Way too many rules and pesky little no-no's to suit me.
USPSA is a 'run & gun' type of sport and IDPA is more 'real world' defensive scenarios.
For example in IDPA you must shoot from cover and you dare not drop a magazine - you'll get a 'procedural' penalty for sure!
And they have things like 'failure to neutralize' which means you really didn't take care of the threat! Yeah, OK...
You need to try all of the shooting games...
USPSA, IDPA, Steel Challenge, Cowboy Action(SASS), 3 Gun, NRA... heck why not Camp Perry as well?
That's the only way you'll find out what suits you and your style.