What are your plans for the server? Do you want to set up a blog to post about your life or build an info page for a charitable cause or NGO? It is unlikely that these ventures will place excessive demands on the CPU (processor) and RAM (working memory), and thus hard drive storage should certainly be enough. The same applies to smaller online games and to installing a TS3 (Teamspeak 3) server as a communication platform. A vServer will be perfectly sufficient for these projects. What’s more, the IONOS VPS grants you root access, giving you a lot of freedom.
Recognized for the excellent uptime and ability to handle large loads of traffic, you'll also no longer have to contend with noisy neighbors. Noisy neighbors can bog down the server, but with a Dedicated Server, your web application can perform at optimal speeds. Thus, favored by mission-critical businesses, E-Commerce sites and web pages with significant traffic.
The answer to this question largely depends on two factors. Are you new to server technology and not very interested? In this case, Windows is the easiest option to get where you want to go. Do you already have experience with Linux or would you like to familiarize yourself with this operating system? If so, Linux gives you more freedoms to configure your server, and you will be using an operating system that is less vulnerable to attacks from the Internet. Linux is also open source and therefore free.