Choose HT and Music Rooms


Hi I have 2 Rooms in my house . One 19x20Ft on First Floor and another one 19x15Ft on Ground Floor. Wondering which one should i use for HT and 2 Ch Music. Any suggestions are appreicated.
veerapaneni
One more thing. The room Upstais is a loft and i need to construct wall on one side to make it a room. So i am thinking of using the 15x19 room as HT room and use the upstairs room for music without making any changes to the room.
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I cannot devide the upstairs room as this is next to the stair case and looks ugly if i devide it. How about using 15x19 room on Downstairs for Both Music and HT ?