Peace was generally secured by worldwide empires (for the known world of the time periods). Ex: Babylon, Rome, Mongolia, Spanish, Britain and today USA.
Today, we have free religion, freedom (no slaves), more luxurious goods at cheaper prices, education, high literacy, a lack of infantile deaths due to the advancements of medicine and more.
I certainly prefer today vs Roman times or even Spanish Peace or Pax Britannia.
Of Pax Americana, today is certainly better than the Cold War, WW2 or other times as well.
To those in the Middle East, they look back upon the peace established by the Muslim Caliphates like the Ottoman Empire or whatnot. So it does depend on where you live.