On my old N/A Silvia I started off with Bilstein shocks all round, and slightly lower / heavier springs (on the car when I got it).
One of the front shocks went clunky, so I replaced the lot with KYB adjustable height coilovers. They worked really well for a while (a year maybe) then the fronts went creaky and one of the rears started leaking.
I replaced them temporarily with a set of KYB Gear Climb gas shocks and dodgy cut springs, which drove very nicely, except for scrubbing on mid corner bumps under brakes.
I then installed a set of Cusco coilovers with adjustable camber tops. I ran about 3° negative camber at the front, and was still wearing the outside of the tyres
Handling was improved quite a lot over the KYBs, but ride was rock hard.
I added a Whiteline swaybar (extra heavy, adjustable) to that, which made a small difference to cornering - mainly in fast tight stuff.
A rear Cusco was broken when the car was t-boned, and the fronts had started going noisy after a few months.
The S12 Gazelle I drove for a while had GET coilovers in the front, with camber tops, and they were the best compromise I've seen. No coilover rattling, no jarring ride, just flat cornering and smoothe handling of bumps.
I now have another S13 Silvia which has Bilstein Struts all round, and the heaviest springs I've seen yet. It also has camber tops on the front, and pillowball tops on the rear (which are very noisy and need replacing)
This car will get the Whiteline swaybar soon, but already handles extremely well. I'd rate it above the Cuscos I think. The Bilsteins are not height adjustable like the Cuscos though.
All cars have had front strut braces, which make quite a difference in the right conditions, and the S13s had/have rear strut braces (which don't make much of an obvious difference)
One of the biggest differences, and the thing that most people leave till last is tyres. Tyres can make or break a suspension setup.
When I got my first S13 it had some bridgestones on it, which were not too bad, but a pretty standard tyre. I replaced them with G-Grids - which are not a sports tyre as such, but actually gripped quite well, and lasted 40000k's with about 5 track days in there which is pretty damn good.
I was then sold a set of Pirelli P6s on various peoples advice, which were apalling to drive on. The car felt vague and soft, like it was riding on sponge. I managed to get those swapped for a set of Falken Azenis ST115s which have been used on all three cars to some extent. They grip very well wet or dry, and are quite good value - but they don't last as well as some others. I have managed over 30000km and a couple of track days out of them though, but they're pretty much totally bald now.
On the Gazelle I tried a pair of Yokohama A510s, and they lasted 5000km from almost new condition to worn all the way through. I don't recommend those