i have both the white and the glow in the dark aka black light.
i like them both very much, i use the white on everything but light color fabric which i use the glow in the dark on and just turn on the black light so i can see the marks.
they also make crayon size sticks and bars the size of tailors chalk - these are only available in white not glow in the dark.
i also really like both of these products too.
i use whichever one works best for the situation on hand.