The FG knot is Seth Feider’s favorite line to line knot. It boasts both exceptional strength and a small size that allows it to slide through rod guides with ease.
On a related note, braid to fluorocarbon leaders have become his go-to flipping and pitching line set up for the reasons provided here (https://youtu.be/8YolQw-COow). Powerful hooksets place a lot of stress on the knot and is when slippage occurs. Seth combats this risk by adding a few additional steps to the traditional FG knot that provide an extra failsafe against slippage.