My personal favorite is the original Crybaby. I've tried some Morleys and in my humble oppinion they suck! Do try the Morley Bad Horsie (Vai's model), optical control and no switch, but it cannot be left in one position to be used as a filter. Vox wah is good but not aggressive enough for me. Boss wah doesn't move enough and the switch is to sensitive. Upgraded Crybabies ( 95Q, 535Q...) are the most versatile I've tried, and they (as well as other Crybabies) are really heavy, so it won't get accidentally pulled around. Try all you can as there are many variations and given enough time, you'll find the one that's just right.