Help - Best Room for Studio?

[recordingsounds]

All,

My current studio is downstairs in which was suppose to be my
dinning room. It has hardwood floors and 9 foot ceilings and the
recordings in the room sound great. I'm in the process of adding
a full drum kit and it will probably be too tight a space to keep
the drums there. I could always lug them downstairs from my
bonus room everytime I need them which is probably only once
or twice a month.

The other idea... I have a much larger bonus room upstairs - probably
twice the floor space (around 20 x 20ish) but...it only has 8 ft. ceilings.
My wife has agreed that if I decide we will replace the carpet in the
bonus room with hardwood floors and use it has my recording room.
I know that it is impossible to know until you actually hear the room
but I'm looking for some advice before I spend the money and effort
on the hardwood floors upstairs. From the following room descriptions
which (in your personal experience) do you think would sound best for
recording:

Downstairs dinning room: 9 ft ceilings, around 12 x 12 adjacent to 2 story
open entry way and adjacent to large living room. I record vocals in the 2
story open entry which sounds great. Problem - I can't close it off when
recording/practicing and too small for permenent drum set.

Upstairs bonus room: 8 ft ceilings, 20 x 20 with double doors into room
(great for hauling equipment in/out) - and I can close the doors. Currently
has carpeting but would replace with hardwood floors for the entire room.

I realize it's a SWAG - but - Which would probably sound better?
Thanks!
Edit/Delete Message

[TexRoadkill]

Record some stuff in each room and see which one sounds best.