I used to have the SW cc and I swore nothing in the world would ever make me give it up. That was until I just happen to be inside a Chase branch (who carries the SW card) and dh and I were each offered a 50,000 point bonus to try the Chase Sapphire Preferred. We were about to put a small addition on our home and we knew we'd have no problem reaching the minimum spend requirement and paying it right off. Once I tried it, I was hooked.
What I like about it vs. the SW card is that with the CSP you earn double points for any dining or travel. That includes everything from take out to airport parking, taxi, my train tickets to work, etc. Not just flights. I couldn't remember the last time I earned double points with the SW card. It rarely happened because we fly with points so often and it was rare that we actually used the card to buy anything substantial from SW which is the only purchase that earns double points with the SW card. It is nice to be able to book flights with SW points. If the price drops and I "change" the flight to the same flight again at lower price, the points difference gets refunded back to my account.
What's nice about the CSP card is that if we wanted to we could always transfer Chase Ultimate Reward points directly into our SW RR account at a 1:1 ratio so we don't lose anything by making the transfer. I could also use points to book travel (flights, hotels, rental cars) directly through Chase. When you book travel through Chase, points are worth 25% more. Also one can transfer points directly into a hotels loyalty program such as Hilton or Hyatt and many others. The travel partners change occasionally. There used to be several airline programs we could transfer points into such as American and British Airways. I haven't done that yet but some day maybe.
Once my points started piling up with covid, I used their Pay Yourself Back program to redeem points for a statement credit. It was at an extra 50% bonus but now points are worth an extra 25% for this program. With things opening up again I will start saving points for future travel.
To me, it's a very versatile card that out earns the SW card.