What do you plan to do with it?
I bought mine for hiking and possibly as a backup to a rifle for hunting, so I went with the 29-8 Mountain Gun, blued 4".
I find the longer barrels uncomfortable for carry, and I like the balance of a 4" better anyway.
If I were going to shoot silhouette, or from a rest, then the longer barrel might be my choice, but generally the longer ones don't fit my specific needs.
For a collectible, you should go with whatever you like better, or whatever one would be harder to find at a later time. While I am sort of developing a small collection, I only "collect" guns that I shoot. No NIB, presentation grade guns in my safe.
Cheers,
M
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