[mrreality68]

This has several levels.
1.The biggest being are you an investor or collector. Or a Combo. I am a collector but long long term my collection will turn into an investment(as my kids are not into collecting)

1. 1952 Mantle Iconic and sought after by both collectors and investors.
2. many great cards in that era of players that have spiked in value over last few years like Mays, Aaron, Jackie, etc. Is the market going to give them more long term upside than the 52 Mantle.
3. Who are the investors/collectors of the future. Will they buy vintage or be more focused on the Modern Market.
4. As some mentioned what are you able to get for the $50K in a 52 Mantle vs other cards for the same money
5. Is your comfort level is to diversify (to minimum risk or to have more) or not.

But in the end it is more a matter of preference and no choice is a bad choice