I installed a Cencom Gold a few months back in my truck. I had hell with it. The instructions are confusing and there are a million wires and only a handful of inputs. On the other hand, the 4200 took about an hour to fully wire in and program. The software is very simple to use, there are more outputs than Hatzolah could fill up, and the interface is just prettier IMHO.
Plus, with the embedded HLF you get an extra product with the controller. You can also use the various inputs and outputs to control your entire vehicle.
Hands down, price and function, looks and ease of installation, the 4200 wins the game for me.