First things you have to choose with web hosting plan is web hosting operating system. It could confusing to choose which is the best. Here is list of web hosting operating system and information about the performance.
Linux, a version of UNIX, is a very versatile platform that serves a number of functions well. It is particularly suitable for meeting your Internet requirements, such as mailing, streaming, Web serving, and fileserving. Linux is a very cost-effective choice it uses hardware efficiently, and allows for more web sites per server, thereby lowering the cost of hosting per account. Linux servers are compatible with certain Microsoft extensions and applications, for example, MS SQL (a database program) or Microsoft Front Page (a web authoring tool). Many engineers prefer the flexibility, security, and control of Linux servers. Linux is Open Source (free) software and a host of free programs are available to users of Linux.
Microsoft Windows NT/2000
Window's 2000 graphical user interface makes it user-friendly and provides a familiar interface for most IT teams to work with. It integrates well with other Microsoft applications and there are a wealth of commercial applications available for this platform. Particularly attractive is the integration with Microsoft Application Server (ASP) which allows the creation of dynamic web pages linked to SQL databases, and other Legacy back office systems.
Sun Solaris servers offer the highest level of resources and power - these are the most robust servers! Sun has a proven track record and is deployed in many large Fortune 500 corporations. It is a mature platform and there are a large number of applications and development tools available. Because of Sun's capacity and stability it is ideal for high-traffic functions, such as database servers, high-traffic Web servers and mission-critical servers.
The RaQ was designed for virtual (shared) hosting of multiple Web sites. It's simple administration makes it a great first Web server. Its flexible administration interface also allows you to share administration responsibilities among your staff.
FreeBSD is a version of BSD that was designed for the X86 processor. FreeBSD is a very stable open source operating system, and a good alternative to Linux. It is an extremely well-integrated and tested system, and is inexpensive. There are a large number of free applications available for use with it