RE: Which is a better Deer Gun???
More than likley the 30/30 is the lever action and the 308has the clip
Even so the 30/30 will hold five to seven round's.
I agree with muzzleman it all depends on where your hunting,They will both do the trick.
The 30/30 is limited to 100yds and a little further.If you choose the 30/30
I would sight it in at 1 inch high that way if by chance the deer is a little farther than 100yds you would still get a good clean shot on it.
Take them both out a shoot a few rounds thru them and see which
feel's more comfortable.
Good luck in your quest.