I've had both those windscreens..Both are good and you won't go wrong whichever way you decide. I stuck with the Madstad 11 and like it a bit more as it both let in more air while also reducing turbulence. The F4 looks better. It's a matter of choosing looks vs functionality.
Part of the 'Functionality' is where you live. In Northern Indiana the F-4 tinted 5+ has been great for me. Do have the Baker 'Air Wings'. Flybuddy in Florida and CHIEFP in warmer climates the Madstad will let more air in.
