@Ismael **************
have you already have a Thai bank account? If not it might be challenging to get one now. Marriage Visa requires less money hold in bank 400k around 3 months but more paperwork than retirement visa. Retirement visa requires more money in bank 800k and can’t drop below 400k. You can opt for 65k monthly method later on. Less paperwork. So you choose which one is more suitable for yourself.