Rear suspension explanation needed

[libila]

I'll be honest, I haven't been researching as much as I want to but I need someone to clear this up for me. I need a clear explanation please. Seriously, talk to me like I'm ten years old and explain the differences, benefits, disadvantages, cost, etc for the different types of upgraded rear suspension; ie uniball, Porsche bits etc.

I have limited internet access here in Germany, and I can't read german so the sources here are almost useless. I would greatly appreciate it.