As soon as you add this service to your shopping cart you will be able to choose the platform for it.
SUMMARY: Unless you need to use .NET, ASP or Microsoft SQL Server, we recommend choosing Linux.
Extended explanation:
First of all we must emphasize that the web hosting platform to be contracted is related to the programming language you use for your site and NOT to the operating system you use on your computer. For example, if you use Windows on your PC you can easily contract LINUX hosting, in the same way that if you have a MAC or a PC with Linux you can contract WINDOWS hosting.
In general, the Linux Platform covers most use cases and is the most recommended if you are going to use languages such as HTML, PHP and technologies such as MySQL, Ajax or FLASH. Unless you use ASP.NET, ASP, SQL Server or Access DB in the development of your site, Linux is the best option.
If your idea is to take advantage of Open Source applications such as Wordpress, Joomla, OsCommerce, etc. Linux is ideal.
Now, if you are not the one developing the website, we suggest you contact your programmer to tell you which platform you should hire.
In any case, you can now hire the Linux Platform plan with the peace of mind of having 10 days to change it free of charge.