WATCH POP

I have a lot of doubts.

To buy a new Omega broad arrow (mouvemnet coaxial) or a preowned Breguet Transatlantic type XX (mouvement derived from Lemania 1350). The AD says that Omega has a better mechanical.
I like chrono watches, I have a Minerva Palladio 24h DT (Valjoux 7750 modified, a Paul Picot 4888 (Lemania 1874),an Omega speedmaster automatic (Valjoux 7750) and now I would have a sport chrono.
The Transatlantic is very nice (I like a lot) but I think the Omega is better.
What is your opinion??

thanks
Albe thank for your reply,
but you consider the Transatlantique mechanical better than Broad Arrow (with 3303) or viceversa?(without to consider the look).
I am not an expert and may be I am talking of small and not important differences.

Albe