Corporation tax is 20% and you will have extra accountacy fees and so on, cant see there being any real benefit to most if not all sole traders, but as Soupy said, get advice from an accountant.
Corperaton tax is 19 percent, and that's if you decide to keep a profit in the business. Nothing stopping you from investing the rest of the profit into the company by purchasing a van or equipment to the value of your forecast profits to show a net nill or small loss. You cold even buy more goodwill to the value of your profits to expand.
The other bonus is corperation tax is completely the companies responsibility to calculate and pay, its worked out by your tax advisors and you pay it 10 months later, with no payments on account to make either which is a real hurdle for sole traders.
You can get funding eaiser, if you can demonstrate a profitable business, it goes on the public record and you can sell shares of your company to raise funds.
You can borrow money from your company, and pay it back with interest which has tax advantages for both parties.
You are entitled to a dividend allowance, which is tax free.
Moreover the equipment, goodwill and assets of the company no longer affect you. Say you decide to sell off a round, well that belongs to the company, and if you were to sell off 30 grands worth of goodwill, you can draw down the funds through paye under tax threshold over a few years and pay no tax.
Its more flexible for expansion.
The list goes on and on.