Are you shopping for a vacuum cleaner but confused about which one to buy? You're not alone! There are dozens of different vacuum cleaners on the market and it's difficult to tell which one is the best vacuum cleaner for your needs. There are HEPA vacuums with HEPA nbsp;filters for people with allergies. There are vacuum cleaners for pet owners. There are vacuum cleaners that have won design awards and vacuum cleaners that haven't.  Consumer reviews are no help and neither is Consumer Reports. Why? Because they contradict each other. Here's how to determine which vacuum cleaner best suits your needs.