I couldn’t tell you about the brakes on the 240/280/300 Z cars. The Brembos on the Track model 350Z were just fine for my purposes.
As far as the design, I love the look of the 240 and 280, but the 350Z only retained a few hints of the previous generations. Primarily the slope of the rear end, IMO. Otherwise it’s a much beefier, more muscular look.
And TIL that there’s a seventh-gen Z, the 400Z.