Is it ok to blow-dry with round brush when hair is completely dry?

Or would my hair lose its moisture and flat ironing is a better option?

Is it ok to blow-dry with round brush when hair is completely dry?

If it's completely dry, then blow drying won't do anything to it. Better flat iron.

Is it ok to blow-dry with round brush when hair is completely dry?

It should be okay as long as your hair is well conditioned and you don't resort to using heat on your hair on a regular basis.

Is it ok to blow-dry with round brush when hair is completely dry?

That wouldn't do anything for it though if you wanted to straighten it.