Even with the historical self-inflicted nightmare they had at the end of 2022, SWA is among the top 2-3 on-time performers in the US. All-in-all, it remains among the most reliable for leaving and getting you to your destination on-time. But that's literally the only "set apart from the others" factor it has going for it now.
Otherwise, it has become indistinguishable from any other airline (other than the bottom-tier -- I ain't flying Spirit). So, the way I USED to search for short to medium haul domestic flights was....go to SWA.com, and book my flight. Now, I go to an aggregator site like Kayak, and find who has the best schedule/route and best fare. I generally prefer a couple of carriers, but I'll fly United or Delta if they offer the best package (for example). SWA now just goes into that mix, instead of being my default preference.
I fly around Texas, to California once a year, and to Vegas from time to time - that's 95% of my domestic travel. American, Alaska, SWA, shit, even Frontier to Denver....they've become interchangeable.