Asking for the best datacenter is like asking for the prettiest woman on earth... maybe you have an idea of the perfect woman, however a lot of people will disagree with you, as some like them tall, others like them short, some like brunettes while some like blondes, etc.
Just to prove what I say, I love datacenters that provide unmanaged servers, as I have a dedicated team of server admins working for me, so I hate those datacenters that try to help the customer in every possible way and ask you to share your root passwords with them. However there are some users/hosts/companies that prefer those datacenters that provide managed servers and that are able to assist the customer in every single task.
Instead of asking for the "best datacenter" you shoud ask for the datacenter that provides the best [fill in with your requirements here].
Bocacom is superb. We have worked with numerous datacenters and overall Bocacom provides the most helpful and in touch support/service. They will go out of their way when there is an issue where as most dedicated server providers would not.