To add to the previous comments, what's most important to many, especially casual, riders considering IGH hubs is the range of gearing, not the number. More gears with a similar range to a particular 3 speed hub you're considering may end up requiring more frequent shifting without a lot of benefit to you, depending on your use. This is where a local shop often makes the purchase decision easier, since they can ask the right questions about your intended use, they know your local terrain and riding conditions, and they have access to information on gear inches/range of gearing on all your options. You can find it all on the net, but it may all be ancient Greek to you if you aren't familiar with the terminology and concepts.