For the lightsabers, which is actually better? I'm a scoundrel, think i might go consular this time around. Malak and Revan both only use one saber, which is better to go with?

It all really depends on your attributes and feats. If you have a high dex and the two weapon feats.. then go with two weapons for the higher damage output..

but if you don't have a base attack bonus of at LEAST +13/+10 with two weapons equiped don't bother..

and if you do.. try to get a "short lightsaber" to use in the off hand.. it has a smaller attack penalty.

if your going to do two weapons then youll want to get master two handed fighting as soon as possible.

Until then I'd stick with a dual lightsaber.

Is a two-sided lightsaber the same as two lightsabers? Just made into two?

nope, they can have just one crystal with two power cells and is focused out both ends. but the most powerful ones have 3 crystals.