is what you'll get the most enjoyment from during your years of ownership.
But since you asked...since the perpetual calendar is $60K and I believe the skeleton is $45K, you might lose less on the skeleton (also having saved $15K on the initial purchase). But at these prices, I would encourage you to buy the one you're most passionate about. I would never settle for second-best (at these prices) just to save a few bucks on resale.