I think it's horses for courses. I have shown under the GCCF and TICA. I think there are pluses and minuses to both sides. Probably TICA shows tend to appear to be friendlier because on the whole they are smaller than GCCF shows, but with both your day is governed by who you are penned next to. Both can be as political as one another and what ‘look’ of cat suits one doesn’t necessarily suit the other.
Everyone has their favourite formats, and TICA and the GCCF are completely different. I have bred/owned titled cats under both registries including a TICA Supreme Gr Ch Alter and GCCF Imperial Gr
Pr, but my personal preference is the GCCF.
At the end of the day it's about the cat and their comfort so it's a matter of finding out what sort of format fits your cat the best, some may not be comfortable about being carried around in sight of other cats like they are in TICA, and prefer the safety of a pen being taken out on occasion in sight of their pen and then replaced back to safety as with the GCCF. Only you will know what your cat prefers by trying her.