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I'm not sure about that vs I'm not so sure about that

I'm not sure about that vs I'm not so sure about that which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I'm not sure about that is the most popular phrase on the web.

I'm not so sure about that

1834,000 results on the web

I'm not sure about that

19,090,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • I'm not so sure about that.
  • I'm not so sure about that, brother.
  • Mabel, I'm not so sure about that.
  • We've done so much together, it seems like we should know everything there is to know about each other, but after hearing you talk about your mother before, I'm not so sure about that.
  • I'm not so sure about that.
  • Actually, I'm not so sure about that now.
  • I'm not so sure about that anymore.
  • I'm not so sure about that.
  • I'm not sure about that last one.
  • I'm not sure about that too, Miss.
  • You know what? I'm not sure about that.
  • Phillip: I'm not sure about that. I'm not sure but I believe there were two Ungano's gigs.
  • No, I'm not sure about that.
  • I'm not sure about that last one.
  • I'm not sure about that holy part.
  • Evan, I'm not sure about that.

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I'm not sure about that vs I'm not so sure about that | GrammarChecker.io