In this deal they are offering unlimited websites with 100gb storage for each website and their custom website building tools. Please provide me with valuable feedback
I'd recommend you look at getting the deal with the Service Provider, as the possibility of having security misconfigurations on your own WordPress instance is far higher.
Going with a service provider restricts the amount of things one can configure (or misconfigure!)
Feel free to reach out to me if you need more input on this topic :)