I almost always go E, W, Q. I only use Q sparingly for good engages or escape attempts, use W to mess with enemy combos or engages, and rely on E and passive to see me through lane. Cho can be extremely mana hungry if you rely too much on Q and W, which is why I'm a fan of playing around E's strength.
With E, you don't drain your mana bar, get free damage which makes last hitting easier and in my experience, allows Cho to win a lot of melee matchups (which is great when the AD enemy is beaten down in an auto attack fight).
I like W second mostly because I find it's a more reliable and useful cc in lane than Q (especially against mobile laners), and I primarily rely on Q for utility, not damage.
Hope this helps, Cho has to be my favorite champ.