What "X" tippet do you use?

[TylerKunz]

Here's a question... If flouro is invisible to fish could you use 5x on dries? I seem to be losing to many flies lately on 6x ( obviously i need to work on my knots) and was just curious what folks thought. I have used it before but I just cant figure out if its better or worse as far as catch rate. Maybe it doesn't make a difference.
[signature]