Submariner ceramic or Reverso

[V...]

Both. One for casual one for formal

[D'Andy]

If this was your first watch, or if you have not have a diver watch in your collection, then you could do no wrong with a Sub or SD4k (top-up a little for a watch that is much better than a Sub, looks-wise and technically). But if you have gone through a few watches and/or lack a dress watch, then a Reverso duo would fit in just nice. A Sub or SD4k is a very versatile watch.

[Nkssupreme]

Sub c! Looks good on any attire.

[Danielo]

For me, it would the the JLC Reverso.

[kygan711]

 I will need both for different occasion usage. Both are nice. Can't go wrong.

[jayz1990]

You will end up getting both. Both are classy watches with history. The Reverso for dressy events and Sub C as a daily beater. If you want a watch for every occasion, get the Sub C. Just my two cents.

[rrk]

Owning both (1931 reverso), I would say buy the Sub first as it is more versatile and goes both with formal and casual wear.

The Reverso is also an amazing watch but more formal.

You can't go wrong with either watch.

[berdsc]

If you already own a 'R' then go for JLC.
For me always first watch will be 'R' then the rest is very much up to own preference.