2. hasty are the way to go most of the time. But you have to judge the right CV ratios, and also the number of men/elements taking part in the battle. Else, you can easily get some black eyes. Remember that hasty attacks use only half of the unit CV AND half of the unit men/elements.
As a rule of thumb, always consider the number of men (or elements) in your attacks, both hasty and deliberate, (and also fatigue, exp etc). By exemple, if you use a regiment to attack a full division, you may have an initial 5:1 CV ratio in your favor, but if the enemy has more elements to fire at yours, he might end up creating a lot of disruption, and you will see a big drop on your CV when the final odds are calculated.
"So much trouble in the world!" -Bob