..."My" personal preferrence, is mostly cloudy with few amber on most strains. But you must find the point of maturity that "you" like best. Try taking a small sample starting at around 50% clear/50 foggy or milky. Work your way through, taking a sample every few days as you notice more milky and/or amber showing, untill you "find" your sweet spot.
The more amber, the heavier, more sedative the effects.