Which Room is Best Between These Two

I have a nice system currently set up in a small spare bedroom.  The system is made up of an integrated amp, CD player, and larger stand mount monitors.  The room is 10'-11" wide by 11'-1" long with 8' ceilings.  So not that big. The speakers are set up along the 10'-11" wall due to layout.  Being almost perfectly square I feel the room is a limiting factor for this set up.  

We have another small spare bedroom rectangular in set up that has dimensions of 9'-3" wide by 13'-2" long also with 8' ceilings.  The thought crossed my mind that this might be a better room to set up in being rectangular in shape.  But the narrow width concerns me.  I could probably set up along either a short wall or a long wall.  

The negative side to a change in room is all of the moving of furniture and system.  But if it will create a better environment that would be a worthy consideration.

Does this size rectangular room/proportion present a better environment?  If so, would you set up the speakers on the long wall or the short wall?