You cannot go wrong with either.
GTS is the best handling.
Turbo has stunning acceleration and a great ride.
Turbo with performance pack has 40bhp more than the Turbo but also has the GTS suspension.
I have a Turbo, with air suspension, spyder wheels, 14 way seats, LEDs and a few other goodies and would not want any other Macan variant.
Macan 1 S diesel, spec scimilar to Turbo
Macan 2 Turbo, Air, PASM, 14 way, SC, PS+, Spyders, Surround Cam, LEDs, Met Black, Garnet, Pano, Privacy Glass, ACC, Alloy PDK, SD mirrors, Interior light and storage packs.