Sting was in TNA longer than WCW, Steiner was better after he left WCW, and Hardy and Lashley had the best matches of their careers in TNA.
First off.. Sting was WCW... Most of us don't see a difference from Jim Crockett NWA territory and when it turned into WCW which was always on TBS and later on TNT. They all mesh into pretty much the same thing.
Steiner was not better after he left WCW NOT IN A MILLION YEARS!!!
Pre Big Popa Pump he was arguably one of the most athletic and impressive in ring performers in the world. The moves he was pulling as a huge tank of a man were insane. His runs in WCW, Japan and WWF in the early/mid 90s were absolutely glorious.
Once he couldn't pull that stuff off cause lets face it he got even bigger and well older, he switched his Gimick to Big Popa and worked a much more grounded wrestling moveset. His Big Popa Pump gimmick was at its best in WCW cause he had no filter, and him with Buff just fucking worked.