Yeah, for the most part people have their brand, and they LOVE to argue about it. Realistically speaking you do need to choose. If you buy a DSLR, you will have a host of accessories you will need and none are interchangeable, so a Canon body will only take Canon lenses and flashes, and remote releases etc, but there really is no wrong answer, they're all amazing technological marvels in tiny tiny packages. Mind boggling really.