Best Website Builder for Small Businesses?

I'm in the early stages of starting a small business and need to get a website up ASAP. My top two priorities are to make it look professional and to get traffic. What's the point of having a beautiful website if no one is going to visit it?
Are there any platforms that offer a good combination of design flexibility and marketing tools, especially ones that don't require a lot of investment?
I'm open to anything that combines affordability and growth potential.
I'd love to hear what's worked for you or your business.