Depends on where you buy them from. I like the OPC from a value perspective - but keep in mind there is no Molitor card in the OPC - silly me forgot that the first time I bought a 78 OPC box. You will have centering issues with the OPC, but I have had luck finding a bunch of 9s and 2-3 10s out of 4 boxes from BBCE.
A topps box will cost you at least double the opc. The opc will probably yield 1-3 murrays although they may not be centereed. The topps box will be better centered but is a much larger set so you are going to see a lot more commons. either way is a no lose situation as you will have a ton of fun
OPC - if you get centered cards that have reasonable corners. Topps if you get some key cards.
Risks and upside to both. Freemarket has dictated the prices where they are.
I am actively buying MIKE SCHMIDT gem mint baseball cards. Also looking for any 19th century cabinets of Philadephia Nationals. Please PM with additional details.
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You will have better success pulling centered cards from Topps than OPC. Even though to me, OPC was more fun to open.
I would go for the Topps.
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Good luck and share the scans.
Steve
Risks and upside to both. Freemarket has dictated the prices where they are.