Digital BW, The Print

I just noticed something that I can't figure out. Perhaps everyone knows about this and I am just very slow on the uptake. I have been working in Camera Raw and Bridge and then into Photoshop of late. I just realized today that the way my image displays is vastly different in PS than it is in Bridge and Camera Raw. 
The PS version is flat tonally and not as sharp, whereas the Bridge and Camera Raw versions are crisp and at least one contrast grade up. The Camera Raw version is much better than the PS version.
What is causing this difference? Which one can I trust? How can one edit an image if you can't rely on what is on the screen. I mean, at least the different software displays should match, right?
Any insight into this issue would be greatly appreciated.
Paul Kohl