I would personally stay with Linux not only for the cost savings but dealing with Microsoft licensing can be a pain.
You also generally will have less overall issues with a properly setup Linux server compared to a Windows server, at least in my own experience.
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It is not easy to decide which hosting is better for you Linux or Windows. Here is a list of pros and cons of both Windows and Linux OS which helps you in choosing the best one according to your requirement.
It will depends on your requirements, If you have developed site on asp.net you should use windows to host bcoz as linux will supports php, perl, python etc scripting languages and also it supports MySQL, MariaDB. You have to use the OS's as per your requirements
Key Differences Between Linux and Windows Operating System. Linux is free and open source operating system whereas Windows is a commercial operating system whose source code is inaccessible. ... Linux provides high security than windows because Linux is open source. Windows must boot from the primary partition.
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