What is the most reliable engine type for a Ford Focus?

I'm planning to buy a used Ford Focus, but I'm stuck between choosing an EcoBoost or a Duratec engine. Which one is more dependable and has better fuel efficiency?

In my experience, the Duratec engine has been more reliable and has better fuel efficiency.

I've owned both types of engines and I would say the EcoBoost engine is more reliable and has better fuel efficiency.

Based on my research and discussions with Ford mechanics, the Duratec engine has a lower tendency for breakdowns and has better fuel economy.