It's sad that a lot of collectors are simply following the squeakiest wheels.
If you search any topic comparing the hesalite and sapphire, expect to see the words "milky", "ring" and "unsee".
It never fails, I kid you not. It's like computer software is writing posts in this forum.
Fortunately, I got to see both in person, and I brought home the sapphire. The sapphire crystal is so clear and distortion-free, it made reading the time and sub-dials easy. The so-called milky ring is not ugly and does not bother me. Well, not unless you've been brainwashed to think it's ugly.
And I love the movement. The 1863 has better finishing and looks more premium than the 1861. It also has a metal Delrin brake, which is plastic in the 1861.
With most Omega watches having open casebacks, I find it strange that I should pick the closed caseback model.
Lastly, it seems every argument to get the Hesalite is to mention the Sapphire in the negative. Can we please stop this? This is not a race. And they are both Moonwatches.