Adjustable Strut Rods

I'm in the process of rebuilding my lower control arms and have heard of upgrading the strut rods for better steering reaponse/cornering. I'm wondering what differences there are between the hotchkiss ,and the PST adjustable rods and how they compare to stock. And also the reason for adjustment and the spec as to where and how much to adjust. What would the setting be? Is it just adjustment for Caster or does it also affect Camber? And how is Caster adjusted otherwise without the adjustable struts?