What system vps vor charles?(no windows!)

Hello!
I have a problem.
I don't know what system for vps.
I need vps for charles(boxybot working only on windows;/).
This is system's list [Only registered and activated users can see links. Click Here To Register...]
What system should I choose?
Regards
(Sorry, my english is bad, i use my bad english & google translate)

Choose Ubuntu, but only if you know how to use it.

Ubuntu it's easy to use ^^