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Struts have a lot of design constraints. Just because of the way they are packaged. They aren't ideal for awesome handling, but they can be dealt with. As someone said above, the camber curves aren't great. But this is more so on a lowered car. Once you lower a strut car too much, the point the wheel rotates around moves outside of the wheel and the wheel follows an arc opposite of what it should be. But if you adjust the pivot points of the lower control arm or strut, you can get rid of this effect. Granted even when it is following an arc that it should be, it's still not the best.
Compared to an SLA suspension in this regard, an SLA is much easier to get the desired wheel behavior. But unfortunately, there would be a ton of work involved in putting an Z32 suspension on an S13. You are going to have to do something about how the loads come into the chassis because it is greatly different than how an strut suspension loads that chassis. So that will be a lot of fabrication and design. It's not as easy as welding on a mounting bracket and bolting it up, if you think it is, then you should not even be considering this project.
I really don't think this is a good idea for most people to try. The amount of design that needs to go into it to do it right, is a lot more than people think. So, no offense, but if you don't even know why you would want a Z32 suspension besides you heard it was better, then this is out of your league.
So listen to Flybert, if you want SLA, get another car. If you're that serious about making your car handle, you can do it with the struts, there are many successful race cars using a MacP setup.
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