LLC is pretty much a no frills version of incorporating. For a small company with no plans for lots of shareholders it is usually used. Less paperwork and probably cheaper to set up.
From my understanding with LLC's the officers are not held liable for debts personally. I have been doing a lot of investigation and Nevada corporate laws are very laxed so Nevada tends to get a lot of crooks setting up LLC's and taking people for their money in Nevada. Last time I will ever do business in Nevada.