Here are my thoughts:
1. From what I can tell, both watches look to be all original. I kind of like the textured dial a bit better, but otherwise they seem to be the same to me.
2. By the late 1970's, Omega was in some degree of disarray financially. This can be seen in the construction of the movements, which just weren't as robust as some of the earlier automatics (cal. 50X and 56x). About this time, they began switching over from in-house to ETA made movements.
3. Since you are looking for something that may be worn on an everyday basis after a preventative serivce, I would stick with watches a bit older than these. They were just made a bit better. That is unless there is something about the style of these particular watches that appeals to you.
IMO, the glory days for Omega were from about 1948 through 1969,
gatorcpa
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