The best trading system is your own brain.
This is coming from someone who designs computer trading systems.
What I mean by this is in order for anyone to profitably use any trading system, you have to know how to trade on your own, whether its investing, or shorter term trading.
The trading system should be an extension to help you find ideas you could normally not find, or make more money than you could otherwise. You should not look to any trading system as a end all way to the easy life - it does not work that way.
I have one you can try for free, its still in beta, trades US stocks intra day. It literally is free to anyone who wishes to try it out while its in beta, and is a very good tool for those looking to see how to generate trading ideas in real time.
I have also written many hubs on trading here, just look up my name.