Aloha,
I guess one question I have would be.... Are you talking about the pre-cat shafts, cat shafts or 314-2 shafts?
The Pre-cat shafts seem to be better built IMO. The top grain seems to be more uniform through the shaft, and they seem to play better.
When the cat shafts came out, they seem to be more about production and less about playability. You will find most of the Cat shafts do not have the attention to detail on the grain alignment. There is also more issues with the ferrules on the later model shafts through the years, many more splitting or cracking.
With the 314-2, the early ones seemed to have more issues with the ferrules and even less attention to the grain alignment.
Although anyone of the 314 shafts will perform, I personally like the Pre-Cats due to the fact that quality out weighed the quantity at the time.
The best advise I can give you on these shafts is to inspect it before you buy it if you have the option. Look at the grain lines in the shaft and look for consistency therein. If your just ordering any shaft then it can be a crap shoot as to the best playability. If you need I can send you some pictures of the different grain lines you should be looking for.
Aloha