I'm belgian but i honestly don't know that much about beer.
Duvel is pretty good, but not that special imo. Goes to your head quick too for some reason. There was a challenge for a guy to drink ten of them in one hour. After the sixth he got alcohol poisoning and had to be brought to the hospital.
Anyway, i kinda like westvleteren, westmallen, leffe,...
But most of the time i just drink regular pils.