You can do a comparison if you check both at similar times.
You should know what your bank will charge to send - make sure it is in Euros. SCB will charge you 500 baht plus 20 baht if your branch is outside Bangkok . Look at the rate online https://www.scb.co.th/en/personal-banking/foreign-exchange-rates.html but not at the weekend when it generally is lower.......Calculate what you end up with doing it either way.
I found that with my bank it was better to accept all charges which meant I avoided any intermediary/correspondent bank fees (which could easily be $50 or more) and I no longer seem to pay the 500 plus 20 which I did in the past. I know roughly what my bank will charge me within a few $.