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Either of those cameras are complete overkill for everyone in this thread, me included, and both do a fine job- you're splitting hairs.
Go to a best buy or camera store and handle both, then decide. You're going to be handling and operating a camera way more than you'll be using their super minor differences. Spec sheets can't tell you what you find more comfortable.
I did that and went with the z6. Felt better in the hands, better to operate, actual touch screen, just smarter camera design, etc. AF is a smidgen slower but plenty usable.
The native Z's so far are awesome and I like being able to adapt cheaper, often used, Nikon F glass for focal lengths or uses I don't shoot with often. Like Sony doesn't have a good performing equivalent to Nikon's 200-500 f/5.6. They're coming out with a native 200-600 5.6/6.3 that's a stop slower past like 300mm (lol) but for $2k. I got my Nikon 200-500 for $750 and it compares super well to the Sony unless you're majorly pixel peeping. I don't shoot sports and wildlife often so I can't justify dropping $2k on the Sony, but I shoot them often enough that renting is a waste.