Subwoofer for music only ?

btw, square rooms can be problematic, perhaps others here can tell us how they solved square rooms.

and, for Video, Small Home Theater like mine, I use a single sub, just to get things like Jurassic Park Dinosaur Stomps, Black Hawk Down ,,,,, Room filling Impact, not directional unless you have a large Home Theater, then, a pair!

13 by 13 is a small room... After the king size bed, dresser and tv go in, you may barely have room for a microsub such as the KEF KC62. However, It is a more technologically advanced sub that’s better for small room music than your subs listed above (will integrate better, more extension, etc). It is twice the price, of course.

A subwoofer that can’t get down below 20hz is not a subwoofer, just a woofer. Higher standards is key!

Deep_333, I have a queen bed and no dresser. Bed against rear wall that is sound proof wood slats and stereo against front wall. I had a Paradigm sub I placed under the foot of my bed and it died recently. I'm only using for music, No TV in bedroom.

As opposed to what?

I would always go with whichever sub gave me the best EQ capabilities.