Turbo/Turbo S for street, all-around (even year-round) use, and straight line speed.
GT3/GT3 RS for the track.
Long story short, Turbo drivers are poseurs. (Hey, don't shoot the messenger…)
The enthusiast's and real driver's 911 is, undisputedly, the GT3/GT3 RS.
But as the Evo videos below demonstrate, the 911 Turbo S is too often underestimated in terms of just how "all-purpose" a car it is. Reality is, the Turbo S is about as capable on the track as it is cruising down the highway and doddling through a shopping district.
The Turbo S's track acumen is exhibited in the comparison video below where it matches -- to the tenth -- a 991 GT3 RS around Britain's Anglesey circuit.
For those unfamiliar with Anglesey, it's not all about straight line acceleration. There are plenty of sectors where the GT3 RS's superior aero and more track-focused, well, everything, provide a distinct advantage.
Don't get us wrong, for track purposes we'd have the GT3 RS without hesitation. It's also true that the GT3 RS is built to absorb session after session of track use whereas the Turbo S is not. As indicated in the 2nd video below, the Turbo S put down its fastest lap on lap one -- that's not a coincidence.
And don't underestimate the dude idling through the shopping center in his Turbo S. He might be hardparked and looking for attention, but he might also have a set of Hoosiers in the garage and be capable of blitzing just about everybody at the next HPDE.
Additional Turbo S vs GT3 RS lap time comparisons via FastestLaps.com (the Evo result isn't much of a fluke):