Mix of D and tip for me with brakes for braking - must admit it is VERY rare for me to use anything other than D unless I'm on a country road and will then use S to keep the engine on the boil.
Tip is basically for playing silly buggers with slower cars when I want to make a point  like blowing the Cooper S into the weeds that was climbing all over the back of the car through a 30 so stuck it in tip and 2nd gear to show him how a proper car accelerates 
Not sure any of this makes a difference to gearbox life unless you spend all your time cooking the gearbox oil with left foot braking, aggressive launches etc etc
Big difference with mine after the gearbox oil was changed was how sweet the box felt and smoother changing between D and R
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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