Personal feedback from driving them. They are very unresponsive in the steering and require a lot of turning of the wheel to actually turn them. Example going straight on a roundabout requires nearly a full turn to one side of the wheel unlike most cars requiring just a flick. They feel very heavy (heavier than a supra which most people on here call heavy) into corners and honestly while having good torque the power delivery doesn't feel that great even on a mildly modified one. They are a bit of a noisy car through the body (rear boot/hatch can have quite the annoying rattle to it), this would obviously be an age issue. Obviously you can make any car great with a large budget. But for the most things people modify on cars (exhaust, cooler, tune, coilovers etc) they just don't seem to feel that great when other cars are out there for the same coin.
For the OP's choices of cars and from what he has described what he wants, the 300ZX i just don't think would suit. Each to their own.