The basement game room is pretty large (about 900 sq ft) and it will be designed around the table. I measured for a 8' table and it fit fine. If I go with a 9' I'll have to turn it 90deg.
Hey Buddy.
You have plenty of room there in square feet, but an area is not very useful without dimensions. Your room could be 30' by 30', or at an extreme, it could be 900' by 1'.
The fact that you have said you need to turn the table 90 degrees (going form an 8 footer to a 9 footer) only adds confusion to what you have planned.
If we could some of the design drawings and dimensions it might be easier to help you out.
Certainly, if you can fit a 9 footer, I would recommend that. I would even go so far as to recommend it if it meant you had to shoot shots off the rail at 90 degrees to the table with a slightly shorter cue. After all, that will make you concentrate on you game more (to avoid such a shot) while still allowing you the luxury of playing on a 9 foot table.
Cheers - Dave