#1. The Stunner looks more credible than Pop-up Powerbomb
Although Kevin Owens used the Pop-up Powerbomb to pin John Cena clean at Elimination Chamber 2015, it never has been the same since then. Almost every superstar who was on the receiving end of that powerbomb was able to kick out of it. Powerbomb of any variations is lacking serious credibility nowadays since most of the Superstars perform that move - Roman Reigns, Elias, and Natalya to name a few. Dave Batista's Batista Bomb is probably the only powerbomb in this era that could potentially finish a match.
Thus, Kevin Owens would be more than happy to replace this powerbomb with a finisher of massive magnitude. After all, Steve Austin is totally happy with Owens performing the move and even sent The Prizefighter a few tips to improve it.