Floorstanding or bookshlf speakers?

Depends on taste also.You did not give a price range or if you have amplification.

I have a room about the same dimensions and I have both.To be truthful I love the Bookshelves,but the floorstanders give me more detail they are also 4X's more expensive.

SOmeone mentioned the PSB Goldi and I have NEARs which are in the same league.My NEARs are modified versions of the time they were compared in a side-by-side at Soundstage.

I think you might get a bigger soundstage using Bookshelves in the room your size.

Go and listen to some to see what your taste are.

I second Abex's thoughts.
It all depend on what you like to listen to.
Me, at the narrow end of the room, (dimension is same as yours except the H at 12 feet), stand diminutive Proac 1SC on rigid stand, 3 feet away from the rear wall. I love the visual unobtrusiveness of it all, and best of all, paired with single ended triode, it emulate, just the way I like, the purity and lushness of the orchestra and voices and the space where it is recorded. Personnelly, when I went full range, I used panel speaker, (as I will again soon when moving) otherwise I prefer monitor on stand.

Check out the Gershman Acoustic RX 20 Avant Gardes - floor standing with a small footprint and can bring a full range sound in your size room that you will love. The piano black finish is extremely attractive. I have a pair in my ofiice that is about the size of your room.