I was told that OF doesn't work without photos, so here goes.
I love to wear my pre moon speedys
However, since I'm only allowed to keep
one watch it has to be waterproof with a date function. One strong candidate is my "SD4K" 116600.
The perfect modern Rolex diver IMO. 40mm, glide lock, ceramic insert, no cyclops, maxi dial, no SUBc "maxi case", great proportions (size of case/dial/bezel), blue chromalight lume, satin dial (glossy in some lighting and matte in some), and, as a bonus, a very short production period (introduced on Basel 2014, discontinued on Basel 2017 along with the introduction of the 43mm Red Dweller with cyclops.)
Aaaanyway. This Rolex Sea Dweller is not my one watch pick. My pick is a watch that owns the SD4K when it comes to comfort, and that actually makes all the difference for me and my slender wrist in this peculiar dilemma. My one watch pick is my SMP 2254.50. Very slim, light and comfy (despite its 41mm) with beautiful sword hands, black wavy dial, and the superb "speedmaster" bracelet. Just look at it.