Which one for the rest of your life?

[RolexLuthor]

Which one of these would you pick to wear for the rest of your life? I already have the SD4K but an opportunity has come up for a trade for the Datejust 41. What would you choose being as im a one watch man. What one do you think would age better as im a bit concerned how the Datejust would look in 20 years. I would love both but financially cant afford it. I know they are both very different watches but part of me does like the elegance of the two tone date just but I have also always had a soft spot for the SD4K, and Ive never seen one in the wild. Photos aren't mine by the way