When people say flex shot for distance I envision torque monkeys eating bananas and dancing with toothbrushes.
It's called a distance anhyzer and it fades straight as it flexes out of the anny line to maximize distance. A distance hyzer-flip is actually a fairly similar line, but adds another dimension to the line as it flips up and over to anny and flexes/fades out straight. Depends on the tailwind and the hole as what I'm throwing, although its really rare I throw a distance line on the course. All things being equal I prefer the distance anny because I find it more consistent since it has less dimensions. When dealing with headwinds I throw as flat and low as possible.