My personal suggestion is that you go with whichever OS you are most knowledgeable in. There isn't going to be a huge difference in performance for most situations. Some believe Linux is more secure than Windows OS, but at end of the day if you don't know what you are doing then you may do more harm than good. Last thing to point out is if you are hosting with cloud provider, Linux instances are usually priced less than Windows instances. But the cost difference should not be huge. So I think the key criteria in making this decision is the depth of your knowledge and experience with these OS. Hope this helps!