Does Size Matter?

I just have to interject with a quick question, because it's been on my mind lately.

Do you see this font size here? The one that you are looking at right now? Is it too large? Or is it just right? Here, I will offer you some comparison:

I am considering using this size of font from now on, because it looks more sophisticated or something. What do you think?

I feel like an optometrist. Which one is better? The first one? Or the second one?