As this is a subjective matter, you will have at least a few different opinions.
Age of engine/mileage changes things, personally I would go with Silkolene Pro S or Mobil 1, for engine, decent oil like castrol for the diff, must be LSD oil, and I use gear oil in my gearbox, but most use ATF.
Some also use Millers 10W60 in the cossie engine, as well as numerous others.
tabetha