Your profile says you're a Marriott Silver, so the CL isn't there for you.

The differences might be a slightly more comfortable bed and slightly warmer furnishings at the FS. But you would also get free internet at Courtyard, so it might be closer to a $35-$40 difference.

I've been to both, they right next to each other. For a 13-hour stay, and if the $20 is important to you, just stay at the Courtyard.

Courtyard staff is pretty friendly, a few years ago, the FS staff tried to convince me I didn't have a king bed reserved....pulled up the reservation to show I did.

I'd stay at the CY.