Southwest v Amex v Cap1 venture?

We are about to pay several thousand dollars for our dogs surgery and wanting to open a card to get some perks out of it. We can pay it off immediately but would like to atleast get something out of it.

We value travel benefits and miles that we can use once we spend the $$. Southwest is offering 80k right now, Cap1 venture is offering 75k. I have an Alaska card with status and my partner has chase sapphire card. We don’t plan on keeping the card as a daily driver. I’m looking at these three cards. Any suggestions?