It is easy to configure, great for setting your own file permissions and the platform for most of the free scripts available for download. It is flexible, reliable, and supports scripting languages like Perl and PHP3. NT is Microsoft's baby. One problem I have found with NT servers is a lack of readily available scripts that work on this platform. When you need help you'll want to make sure you can get it.
Some web hosts offer phone support or even live chat.
Make sure they have good tech support in place as there's nothing more annoying than needing assistance with your site and not being able to get it. Some hosts charge an initial set up fee to get your site set up and running on their server. Make sure you check on this when comparing prices. I've seen monthly fees ranging from 9.99 to 39.99, depending on the plan and services offered. My advice would be to look past the cheapest and most expensive ends of the scale and go with a mid-range pricing plan to be on the safe side.