I think that 32 bit vesion will occupy a bit less space on the SSD. I think that is what you are asking.
With a 120gb SSD, that is a negligible difference.
If you have 4gb or more, then the 64 bit os will be better.
geofelt, thats exacly what i was getting after. thanks. ps got it installed with win 7 ultimate 64 bit os and it screams, but its on a new toshiba and there arent any drivers for the hardware that work in win 7. So i put win 8 64 bit and its ok , just a lil slower i think