will be for you to get access to these writers when you need them most. it does not matter what kind of service they are offering, premium or not, but as long as you are not able to get access to them when you need them, you are definitely looking at the wrong provider.
delivery of your work should be done as fast as possible. the earlier you are getting this work done, the easier it will be for you to go through it and request any changes that need to be made to it. this also gives you a good window of opportunity within which you will be able to 