Do you own any other watches in your collection? The safe bet is the SM or Santos and i would imagine majority would say this. The Santos is probably the most versatile since you can change out bracelet and straps but I’ve never personally owned one but seems to be one watch many recommend.
I have owned a SM300 in the past - nice watches but the HEV I didnt like to ended up with a 1957 SM Trilogy which I enjoyed a lot.
Unless you have a specific tie to Cobra or own one then I’d pass on the Brietling. They have some other options which i personally think are nice but never owned which is the B09 Chronograph with pistachio dial but again never owned one.
Finally the Monaco - personally the dial variation shown probably isnt my fave - I would lean to the older Heuer dials with the Calbre 11 movement. I’ve owned the grey Heuer and that was one of my all time favourite watches. It is a little thick but it is such a fun watch and has rich history.
Definitely recommend trying them all on and seeing which one you connect with the most and that should be the one you get.
Good luck!
Haha the price is scary at $37k AUD but somewhat justified with the LUC movement with Geneva stamp, new case to accommodate different movement, larger dial. They said there will be a 10% price increase next year in March so that’ll take the RRP over $40k!