Yes, logic is an abstract noun.

No. though Cubase is a window's pseudo-equivalent to Logic

Logic is a software created by Apple exclusively for their computers.

categorical logic

not to bash Logic(i'm a Logic Pro 9 user myself), but Pro Tools has been the industry standard for so long that this seems almost like a silly question (considering you are comparing Pro Tools to Logic EXPRESS, which is a slimmed down version of Logic ( or a scaled up version of garage band, however you want to look at it))

Its like comparing a geo to a Ferrari. Go with the Pro Tools 8 :D