You will find a number of different options available to you when deciding on the best course of action that you could take to host your websites. The best option would obviously be going for dedicated servers as opposed to a virtual private server or similar other platforms simply because through a dedicated server, you will be guaranteed resources which would assist you with your hosting needs. Check this guide to SiteGround hosting to understand this better.
Whether you are looking to host basic websites or advanced scripts, a dedicated server would provide you the best possible results. The thing with other server types such as shared hosting is that, you get to share certain resources with a range of other hosting clients. This could pose a range of issues to you which includes slowing down your system or resulting in server outages due to overconsumption of resources by a certain client within the network.
To counter this in the best possible manner, it would be best for you to always go for dedicated servers to ensure that you get a guaranteed amount of resources not available to anyone else. When your resources are not shared by others, your websites and other scripts would be loading fast and things would get extremely efficient for you.