Hi, I recently decided to purchase one of two watches: either an Omega Speedmaster Dark Side of the Moon (likely 311.92.44.51.01.004; $12k authorized retail) or a Rolex Datejust 41 Wimbledon dial (fluted bezel on jubilee bracelet; $15k grey market new). I realize these two pieces don't look especially similar, but I find both immensely appealing and near a price point I'm comfortable with. Neither would be intended to be a daily driver, and because they're different and I love both, I can't decide which to buy. I've decided to settle this dilemma based on long term value. I'm not purchasing with the expectation of appreciation, since neither seems especially scarce or likely to become so in the foreseeable future.
That said, neither seems especially likely to experience dramatic depreciation if adequately maintained and cared for. My hesitation is that the Rolex climbs outside $15k if acquired from an authorized dealer. If I find both of these watches equally appealing to the point at which the sole deciding factor is long term value, would anyone recommend against the Rolex due to grey market acquisition? I'm unfamiliar with grey market purchasing, but I assume there's some risk built into the discounted price point. So assuming such a risk, does that risk reduce the long term value of the Rolex by over $3k or otherwise make the Omega a better choice?
Also willing to hear alternatives at this price point that anyone considers clearly superior to the Wimbledon Datejust 41 and Speedmaster DSotM (apart from divers). Really appreciate any opinions or insights here, even if to tell me both would be mistake (would also appreciate why).
That said, neither seems especially likely to experience dramatic depreciation if adequately maintained and cared for. My hesitation is that the Rolex climbs outside $15k if acquired from an authorized dealer. If I find both of these watches equally appealing to the point at which the sole deciding factor is long term value, would anyone recommend against the Rolex due to grey market acquisition? I'm unfamiliar with grey market purchasing, but I assume there's some risk built into the discounted price point. So assuming such a risk, does that risk reduce the long term value of the Rolex by over $3k or otherwise make the Omega a better choice?
Also willing to hear alternatives at this price point that anyone considers clearly superior to the Wimbledon Datejust 41 and Speedmaster DSotM (apart from divers). Really appreciate any opinions or insights here, even if to tell me both would be mistake (would also appreciate why).

