I don't really see a problem.

I don't really see a problem.
I really don't see a problem.

What is the difference between these two?
Which of two is more used in the US?
Please tell.
Thanks

Not much. The second one might be used more to refute a prior statement saying there is a problem, though.

Both

The first means 'I don't particularly see a problem' , the second 'I definitely don't see a problem'.