Keith
The best camera is one that still works!
How about: OM is like a road racing bicycle, while Nikon is like a mountain bike? The Nikons/Nikkormats seem more robust, the OM's more refined. IMO
Having been an OM user for a while now it's been interesting using my FM3A and comparing the two. The Nikon definitely feels more robust and capable to me ... but it lacks the tactile intuative feel of an OM.
Every now and then I take my M2 or M3 from the cupboard, shoot a roll and think ... "yeah so what!" ... then put it back in the cupboard and get the OM-1 out again!