Check the support level
Many a times, one needs help from the customer support. And this may be one of the best ways to check on your provider. Just to check your service provider, you can contact them and seek their help and support.
Their responsive behavior and professionalism can give you a better idea of the kind of service provider they can be for your website. Mind you, this can only give you an idea and you should not take it for granted.
And I would like to add here that there is never a fix solution to one’s hosting needs. There is a huge difference between a small blog and starting out a huge e-commerce website.