I suppose anything anywhere between totally shaved and very well trimmed /kept is fine by me. Personally though I guess my favorite style on my wife is shaved lips and a triangle on top. Though the triangle should be smaller than the area, by about the width of my trimmers :-)
As for myself, I think the less hair the better. I try and keep my shaft and balls shaved from about half an inch above all the way down to my bottom. I keep the top trimmed to half an inch with my trimmers and I like to shave the top in about one razors width. I'd shave it all off except my wife likes a little fur there. But there really is nothing like having both of you clean shaven.