There's currently a high-end eBay auction going on from a consignment company that includes some serialized cards and a red manga. The two serialized cards are the Serialized Egghead Luffy and the Serialized Shanks, the red manga is the Ace red manga. All cards are PSA 10. Currently, the Egghead Luffy is around $4000 CAD (~$3000 USD), the Shanks is around $2400 CAD (~$1750 USD), and the red manga Ace is around $6000 CAD (~$4500 USD).
I was thinking of adding one of these to my collection. I originally thought one of the serialized was the way to go but the red manga already getting such higher bids has me thinking otherwise. The Egghead Luffy is a serialized Luffy card so I expect that to hold a nice premium. The Shanks is one of the OG tournament top prize cards so that should also hold value. The red manga Ace is obviously a (very) rare pull but I don't know if it's rarer than the serialized cards, which are both /1000.
I expect the prices to change by the end of the auction (8 days from now) but I wanted to know what you all think. With long-term holding in mind, should I try for one of the serialized ones or try for the red manga?