Buying first OMEGA, which do you recommend?

Hello everyone, I will be buying my first Omega watch, watch in general, in about a month to commemorate graduating my PhD. I’m having difficulties deciding on one I can wear as a daily driver, and versatile enough to dress up and down. Im currently looking at the a sapphire moonwatch, seamaster diver 300m, or the speedmaster ‘57, but I’m open to suggestions.

I’m a little concerned about the lack of deep water resistance from the moonwatches, in case I fall into a pool or lake, but the diver seems too sporty to dress up.

I would love to hear the thoughts of the experts and collectors.