I have no status with Marriott. I fly Southwest a lot, though, and working toward a companion pass; also, we like to rack up Hotels.com reward stays. I am wanting to use my CSP card to book two nights at a Springhill Suites in September and can't decide if I should book this room through Marriott ($171), Southwest ($179 and 750 points), or Hotels.com ($179 and 2 nights out of ten for a free stay).

Advice??