state library wins hands down.i wish i thought of studying there earlier
no screaming kids, no phones (because all the uni kids will glare at you if it rings),
no distractions (unless you decide to bring your laptop in for the free internet)
it's kinda in the middle of no where, but Martin Place is pretty close to George St
admittedly I haven't been to any uni libraries yet. so my opinion is highly biased
i've been to campsie, auburn, bankstown... always has noisy people
so comparatively, state library is the best