A come across this question quite often, so I summarized a quick overview of both types of business structure. Both LLCs and S-Corps are flow-through entities from the tax perspective and provide some measure of personal liability protection and overall legitimacy. They're both good options, especially, if you're looking to upgrade from a sole proprietorship or a partnership, or if you are just starting a new business.
If you are planning on selling stocks (Equity) and if you want the most possible protection, and if you are planning on looking for investors then S-Corp may make better sense. Conversely, if you don’t want to sell stocks, want less paperwork, but want a cheaper flexible structure, consider an LLC. Keep in mind that neither LLCs nor S-Corps necessarily shields owners from their or their employees' tort actions.
Pros and Cons of the LLC