Besides some of the ones already mentioned:
- Bobby Roode's TNA Championship reign, all of it was great. And Aries winning it off of him was one of the best feel-good moments of that year.
- Kevin Owen's NXT Title reign, probably the best NXT title reign to date.
- Christian's World Title Reign, I know it only lasted a day, but it's not so much about the reign as it was about the following feud with Orton. The heel turn was a slow burn, none of it was rushed. And it was just a great rivalry between the two.
- AJ Style's IWGP Title reign, one of the main reasons I feel like he even got signed to the WWE. His match streak was on fire, and his character was just so good.
- Chris Jericho's World Title reign, his heel character was damn good. And him vs HBK always make for some of the best storytelling you'd see on a WWE screen.
- Jay Lethal's current ROH title reign, no doubt about it.
Can't argue with any of those really. Bobby Roode's TNA reign is what brought me back to TNA for a while when after I previously left when Hogan got involved.