Chrome or Orange?

So I'm in need of a new Ignition Control Unit for my 74 dodge dart sport. Ive seen a few around but have read Orange is the cheaper and original, but I also read to stay away from that one and get the chrome version. So whats the difference? JEGS makes one with a new wire harness and its pretty cheap...
What I do know is mine has a 5 pin harness on it so I will need one with a 5 pin in it right? (Pics below)