Forum Moderators: phranque
Both are fruit, both have high concentrations of Vitamin C. Both will satisfy the 5 a day fruit requirements.
Oranges are messier to eat. Apples are cleaner and can be eaten with the skin or without.
So as to your original question of W vs U, I've always used Windows servers and don't really have any complaints. Therefore, for me, Windows is better. I don't see or feel and restrictions on my dynamic sites.
Let's keep from ranting and raving on this topic.
I also think you need to start from what web server, database, scripting language etc, you prefer. For example, if you prefer Apache + My SQL you are much better off on a Unix type OS although they will run on Windows). On the other hand if you want to use IIS and SQL Server you have to use Windows.
Where is you site hosted? A shared host, a co-lo dedicated server, or on your premises? Linux also gives you the option of a virtual private server (your own instance of the OS on shared hardware).
I use Linux for desktops because it is easy to update software, however there is likely to be less software to update on a server to update (and the OS is fairly easy to update even with Windows) so I guess this may not be that significant.
Unix type OSes have a better security track record, however if you really know Windows well you might still be better off with it, because you will know how to secure it.
FreeBSD and Linux hosting packages (i.e. shared hosting, virtual private servers and dedicated servers you do not own) tend to be better value for money. If you are paying for the software, licensing costs are lower.