Consider what type of terrain you'll be riding on. Any pedal-assist bike will do if you stick to relatively flat surfaces. But if you plan on tackling hilly terrain, you'll want to opt for a model with a stronger motor.
Think about how much range you'll need. If you only plan on using your bike for short rides around town, you can get away with a smaller battery. But if you're looking to ride long distances, you'll need a bike with a larger battery that can last for hours.
Consider your budget. There are plenty of great electric bikes on the market, but they vary widely in price. So if you're looking for the best bang for your buck, do your research before making your final purchase.