What are your priorities as a rider? Are you looking for an electric bike for recreation or are you looking for an electric bike for commuting? Are you traveling long distances? Are there a lot of hills along your commute? Would you like to pedal, or would you prefer to ride solely with the throttle? Do you need the electric bike to be compact for storage, or is space not an issue? These are all things that you need to take into consideration when determining what the best electric bicycle is for you. You'll also want to consider where you live, as your local environment will influence all of the above-mentioned questions. For example, if you live in California you'd want an electric bike that would be through and through a 'California electric bike.'
If you have a long commute and you're looking for an electric bike with an excellent range, then the best electric bike for you to look at would be the OHM electric bike. Similarly, if your definition of the best electric bicycle is synonymous with 'the lightest, best integrated electric bicycle,' the Sanyo eneloop electric bike is the best electric bicycle for you.
If you're looking for electric bikes that don't require any pedaling and can be ridden solely with the twist of a throttle, our line of eZee bikes would represent the best electric bicycles for your needs. Among this line of throttle-based bikes, the best electric bike in terms of comfort would be the eZee Cadence. For easy mounting and dismounting, the eZee Sprint would be ideal. If you're looking for compactness over all else, the eZee Quando would be the best electric bike for you (given that the Quando is both an electric bike and a folding bike, folding down small enough to fit just about anywhere.) If you're looking for something throttle-based with high top speeds, it's important to note that electric bikes are meant to augment human power, not to completely replace it. If you're looking to travel above 25 mph then you're looking for a motorcycle, not an electric bike (expectations explained).
Naturally, this is just a starting point. We offer many more models of electric bikes than what was listed above, and each product page contains a lot more information. You can begin your research more fully here: Help me pick the best electric bike for me!