Okay, guys... Let's not devolve into a Mac vs PC like argument.
To be honest, there is no 'better' OS or 'faster' way as it will always be in the eye of the beholder.
Linux requires a little more on-hands approach to things, Linux was never designed to be 100% user friendly as far as certain things as it is tuned more for computer science type people who will do mid-level programming and spend time talking with others about possible options.
Windows 7, like most of Microsoft Products, were aimed more for the generic user, just as Apple's Mac OS X.
While it is true that there is not as many attacks on Linux that warrants an Anti-virus, it does not mean that it is completely immune. Linux, all versions, will also have its own security patches and packages that will need to be updated from time to time.
Linux will also have lower resource demand programs because of the fact that it actually uses decent compilers and programming languages that are not of the Visual Studio creation, which is not as tightly coded as some of the coding practices of C++ and the like where you are using compilers.
The drawback with Linux will be the flavors of it will often times cause confusion for people who are not familiar with Linux in general about the packages they can install, a bit more than the current issue with Windows where majority of the packages are going to be of 4 to 6 flavors due to having XP, Vista, 2003, 2008 and Win 7, where there are the x32, x64 and the IA64 mixtures. With Linux, on the other hand, there will be several either binaries or you have to compile it for your own build of Linux and again, not many know how to set that up properly by themselves.
Now, to go back to the original poster. Linux will, in most probability, load up faster, getting you out onto the net. I believe Adobe has put out flash player that is usable on Linux, as well as Firefox, Chrome or Opera for web browsing. The problem you might run into will be Pro-IE built websites, where they will want to have Internet Explorer or how IE handles things for web browsing that will be a detriment, as it has been for Macs on occasion with Safari.
If you are planning on doing any computer gaming, your selection of games will be limited to Linux based games, anything popular will probably be mostly First Person Shooters, although the number of those are reducing in time in favor of MMO based games and not many companies wanting to spend the time multi-base coding for a Linux system short on the server level.
Business wise, it is a toss up, although currently, at least 70% of the current business market is favoring the use of Microsoft Office products. While open office is suppose to open Office Product documents, the expectation of .doc or .xls, or even .docx and .xlsx documents are more likely than the Open Office versions.
I know that Ubuntu does have Windows FS support, so you can access Windows Drives without issue, and if you have a decent system, you can virtualize Windows within Linux to cover what you will desire in both cases.