This is very much dependant on what are your objectives for the website, what you consider to be 'development services' and some other factors.
Firstly, web dev companies can specialise in certain languages. Not to say that one is better than another, however this does somewhat affect the quality of the end product.
For example, there are companies that use Ruby, and probably target a different audience of clients & end users to companies which use PHP.
Website itself will make a huge difference. Certain companies may offer services and specialise in small businesses, wheras others focus on scalability and millions of users.
State your objectives, narrow down search and get in touch!