Today, the LLC is most like a sole proprietership. You can choose to be treated, for tax purposes, as a sole prop. or an subchapter "S" corporation. As for which is best for a land surveying
business, it really depends on your tax bracket and whether you will ever make any money or not. For minimizing your taxes and being able to offer yourself a nice benefits packages, there is a very cool way of setting up the structure. An LLC is owned by two entities - 5-10% by a subchapter "C" corporation and 90-95% by a Family Limited Partnership. The "C" Corp is the "manager of the entity and thus can provide benefits.
Good luck finding a savvy accountant. I've had a LOT of them over the years and NONE have advised me without ME finding the info and bringing it to their attention and asking the questions. I attended an event about real estate investing a few years back and heard a CPA, Al Aiello
, talk about this type structure for real estate. He will help you find a good accountant. Of course, I've never made enough money surveying to worry about this. :-)