I use S/F because
-they aren't close to Windows Key
-I'm used to resting my left hand on WASD
-F has a bump on it
-S/F are higher up the keyboard so I don't have to shrink my hand to press Z/X
-I leave them one key apart because the 1-key distance between S and F is less fatiguing on my fingers
-they aren't close to Windows Key
-I'm used to resting my left hand on WASD
-F has a bump on it
-S/F are higher up the keyboard so I don't have to shrink my hand to press Z/X
-I leave them one key apart because the 1-key distance between S and F is less fatiguing on my fingers