You simply cannot buy a better dive watch..
I'm not sure what you mean by "better". I actually have a Rolex Submariner, it was an engagement present, it's the only watch I own, and it means a lot to me because of what it represents.
It's awesome that decades ago, amazingly talented engineers could produce something watch sized that would keep fairly good time, be self winding, and be waterproof to significant depths. So yes, it's a pretty cool artifact, if you are into that. I think that real
watch freaks don't consider Rolex to be head and shoulders above the competition, anyway... but they still admire them as "horologically significant"...
Today, for less that a tenth the price of a Rolex you can get a dive watch that keeps more accurate time.
As far as diving with a watch goes, I'm sure that there will be people here who claim to dive with one and carry tables, etc... but I can't imagine many people using a watch instead of a dive computer. Or two dive computers. Or a bottom timer if you want to be a techy purist who does square profiles and won't use a computer.
Seriously, in what scenario would any dive watch be the best option in 2019? Let alone one with early 20th century accuracy that costs as much as a rebreather? What are you getting, in terms of dive functionality, for all that money? Even Halcyon wouldn't charge ten grand for a backplate....