@helmutkohl - I think that both of the vendors have running production lines so neither is at a disadvantage there. Bell is selling to Slovakia so there could be a common source. Of course Netherlands and Britain are operating AH64 so it seems an advantage to Boeing for logistics concerns.
The radar, situated at the top of the rotor mast can be exposed without necessarily exposing the remainder of the aircraft to threat radar and other systems. The Longbow radar is a low probability of intercept waveform so it is more difficult to acquire. Also on the mast of the Longbow Apache is a Radio Frequency Inferometer (sp) (RFI) that allows the aircraft to acquire search and track radar waveforms. The latest version of the Apache AH-64E "Guardian" has a very impressive battle management systems that allows it to acquire targets and fire on a number of them in less than a minute. Likewise target data can be passed quickly to waiting artillery or fixed wing aircraft.
As much as I have a personal love of the Cobra, other than cost it is hard to see it as being able to truly compete with Apache Guardian.