"Best" is a question that no one can answer for you. I can tell you that the simplest solution for a single-member LLC is to accept the default classification as a sole proprietorship. A single-member LLC classified as a sole proprietorship is a disregarded entity for tax purposes. You report the LLC's income and expenses on a Schedule C attached to the owner's Form 1040 Individual Income Tax Return. The owner takes the LLC's net profit or loss into account in the determination of taxable income, and pays self-employment (FICA) tax via Schedule SE.
Any of the other options add layers of complexity and cost. The partnership and S Corp classifications are really appropriate for multi-member LLCs. While a single owner C Corp is certainly a feasible possibility, it exposes the business entity's earnings to the possibility of double taxation unless the owner's salary and bonuses are carefully monitored.
I hope this has been helpful and will enable you to make a good choice.
