I don’t know what type of driving you plan to do but GT4 for the track or 991.2 T for the street. The gearing in the GT4 makes it a lot less fun as a canyon carver. 80 in second is not super fun if you are rowing your own

Looks like I may be alone based on the comments here but I think PCCBs specced on a Carrera is total badass enthusiast spec. Better brakes are awesome for canyon carving and inspire a ton of confidence to be able to brake late into corners and as hard as possible. As with all things Porsche, do what you like best!