Lightsaber blades: one vs two

Figured we could get a little discussion going on why would a character choose to employ two blades instead of one or viceversa. Some questions that come to mind:

• Are two lightsabers always better than one? If so, why do some characters normally use one while others use two? Possible explanation: it's a matter of style/preference.
  
• Why would AOTC Anakin, who normally uses a single lightsaber, try to use two against Dooku? Possible explanations: two blades are better suited to overwhelm Dooku's Makashi / it was a desperate move to gain the element of surprise.
  
• Why would Obi-Wan use two blades vs Maul and Opress? Possible explanation: two blades are better when dealing with multiple opponents (this lends the question of why didn't Sidious wield his two lightsabers against Mace's team).
  
• Why would Anakin use two blades against Barriss? This one I can't rationalize at all. If he thought he was at a disadvantage against a dual-wielding opponent, then how come he normally uses a single lightsaber for duelling? Plus, he did better after losing his second blade.
  
• Why would Maul initially use a single blade against Sidious, yet switch to two after Savage was killed? Possible explanation: one blade is more practical when tag teaming.
  

Please share your thoughts on this topic. Any other relevant situations and examples you can come up with?

One lightsaber is better, it allows you to use the force more often in a combative situation

Dual blades are more aggressive, sometimes thats what the situation calls for. Sometimes you want more control so use a single. *shrugs*

Hmm, possibly the need for two blades allows for a better defense against a fast opponent?
Although I always theorized that to make Jar'Kai more effective a shoto would be required as opposed to another normal saber.

1 lightsaber is way better

More versatility and protection against multiple foes, and more opportunity for a fast-paced offensive if desired.