Different designers of the web design will charge different charges. Depends on your requirement you can research about the web designer who has the experience in the field and also the essential tools to provide you the output. One thing is certain that the Freelance Web Designer will be affordable compared to the web designer who is belonging to the company. One way or the other you can get the output but in my opinion you should get the services from the professional Web Designer even if they are expensive.
When you are going to get the services from the professional web site design Agency then they will be able to provide you the documentary guarantee that the output will be much better than your expectation. Most of the companies will make the contract with you which will ensure that the output you are looking for is in your hand. You will be able to get the output from them and will be able to get the trustworthy the experience which is not much possible when you are going to get the services from the freelancer. May be the output from some of the freelancers in the field of website design is better than the company but that possibility is very much minimal in reality.
24/7 customer service
The agency who is providing the website design will give you the customer support but the freelancer will not. you should get the website design services from the agency and the charges for that will go from $500 to $2000 depends on the requirement you have. Remember that the web developer and Web Designer can be same person but it is recommended that you are going to get the services from the person who has the specialty in one field. The person who is good in web design should be acquired. You should get the services from the web designer even if it is expensive and output will be much better than the expectation you have.
Because the agency has multiple machines and tools to provide the output they will give you the services in QuickTime. The agency who is providing the services or Web Designer who is providing the services should be having the machinery to give you the output as soon as possible. Because you are using the web design to promote your business and products that is why the output in this competitive world should be happening very soon.