Better keep hidden-secret the DC/AC, always declare it or a mix?

@JeremyECrawford @mikemearls @ChrisPerkinsDnD Tips for DM: better keep hidden-secret the DC/AC, always declare it (for fairness) or a mix?

— Draconis (@DerynDraconis) February 3, 2016

I mix it up – for dramatic rolls, I'll announce it for immediate joy/despair from players. https://t.co/xtegYbf86S

— Mike Mearls (@mikemearls) February 3, 2016