Thanks guys for the differents replies so far, indeed it's a great opportunity to go left seat and then get 1000 PIC on B737 and leave that would be a wise choice.
What made me think about turning down the command offer was the strange and childish behaviour of couple of TRE/I's working with us.
Being a PIC on B737 and having 1000's hours on B737 permits in fact a lot of job opportunities like Ryanair (who's only taking non-EU captains not F/O's). Isn't that true atlast?