Due to a NASA (supposed to be) weekend on stock brakes (which lasted about 2 track sessions with the instructor) I started out with the 4-piston non-vented mounted on stock disc. (just the caliper change and I can't remember the friction material - probably semi-metallic back then) The "butt dyno" couldn't really tell the difference between this and stock.
Disappointed, I installed the Z31 vented rotors with the 4-Runner wide calipers (stock master and booster) - friction was either semi-metallic or ceramic, can't remember. I noticed a good improvement in braking and a large improvement in fade and heat dissipation.
A short time later, I installed Porterfield friction material on all four wheels (stock drums in back). These pads grip about the same as an OEM with normal street traffic, when they warm up they get VERY grippy and do not fade. Goldie likes to hill climb (L28ET builds a lot of torque) and coming back down the hill is much less dicey with this particular friction. At the bottom I still have full confidence as these grab better at the bottom than they did at the top and I've yet to experience fade. I've been on this setup for 7-8 years and I daily drive my 260Z.
I still use the stock master. My youngest son did the same brake swap on his 1975 280Z but replaced the master with a 15/16 280ZX master cylinder. I'm sure there's some difference, but I've never really been able to tell when I drive his car.