It depends on a lot of factors and your goals.
For liability purposes, an entity does not provide any liability protection for the person who causes the harm or negligence. Therefore, if you are working solo without any employees and your hands always do the work, then an entity is worthless for business liability protection. An entity only provides liability protection for the owners of the entity when someone else in the business (like an employee or independent contract) causes harm (Their harm will not cause liability to the owners.).
Also, if you are basically "judgment proof" because you don't have a lot of personal net worth and assets that would be subject in your state to being reached by someone who is harmed from a tort (homes, retirement accounts, etc. are often protected by statute), then you don't have a liability problem to cure. Nobody is going to pay a lawyer to sue someone who has no real assets to get. They win but get nothing. Also, be very careful about getting a lot of business insurance. Lots of insurance can be the pot of money that turns you from being judgment proof to a candidate for a lawsuit. Of course, insurance agents won't tell you this because they are in the business of selling insurance. Trial lawyers look for insurance because it is easy money.
If you decide you need an entity for liability protection, the LLC is usually the entity of choice in most cases for small businesses.
As far as taxes, you have to factor in state taxes as well as federal taxes. Most states put a state income tax on entities (or certain types of entities), so you could be signing up for a new tax for an entity that you don't really need. Paying more taxes for no good reason is not wise.
As far as federal taxes, if you own the LLC by yourself, you will be a "disregarded entity" by default unless you elect to be an association taxable as a corporation on an IRS Form 8832 or a 2553 if you plan on making an S election. A disregarded entity does not exist for federal tax purposes, so your income will flow to your personal income tax return as if you did not have an entity. This is useful for people who want liability protection but don't want to have to pay a CPA for preparing a tax return each year for the LLC.
If you have more than one owner of the LLC, you are a default "partnership" unless you elect otherwise as I noted above.
If you work alone, it would be a hard sell to use an S corporation to escape any employment tax (except for amounts from products or machinery that produces income). If you have others working in your business, then you could pay yourself a reasonable salary (which is subject to payroll tax) and then pay the rest of the profits to yourself as distributions on your stock (which are not subject to payroll tax).
If you want an entity that does the same thing as an S corporation but is scrutinized less than an S corporation, that entity is called a limited partnership. The distributions to limited partners are not subject to self-employment tax (basically the same thing as payroll tax but a different name for non-corporation tax entities and persons).
Most sole proprietors in small businesses (where they do all the work without employees and who do not have a lot of net worth) don't really need an entity and won't benefit from one, but you won't hear many people tell you that because it is sometimes not what the client wants to hear and it is sometimes not profitable for people who set up entities to turn away clients. Be careful about the advice that you get and think about what I wrote above.
I do this for a living (attorney). I may not know much about detailing, but I am an expert in this area. Good luck.