"How should I look at the dies to tell which is the better of the two?
>:(Quit laughing At us nubies We are trying"
Ok, ok, now that I've got my breath back....
Actually, I understand your question but it's been maybe 35-40 years since I asked myself the same sort of question. None of us were born knowing much about either shooting or reloading so we gotta learn.
One die set will be "better", or maybe one die out of each set will be better. But not by much. Both sets were made to the same SAMMI specifications, regardless of when they were made. But, you can't tell anything about them at all by just looking. Qualifing any differences between the dies will take both range work experimentation and some critical measurements of a good chamber cast of each die.
And, actually, for a .30-30, it really won't make a big difference on target. It would take a rifle and an excellant reload capabile of perhaps 3/4" or better to see any differences and few, if any, .30-30s are up to that. That's not a slam at the reliable old deer killer at all, just a recognition of facts. The old rounds are still excellant for their purpose but they were never intended to be precision long range rigs.
I would want to keep the sizer with the largest chamber and the seater with the smallest chamber. That would work the fired brass the least and seat new bullets the straightest.
I'm sure either set will do you a fine job.
Have fun!