Know what you'll use it for as there are many different e-bike styles to choose from. They can weigh a lot more than a regular bicycle, so keep in mind the weight and how you will plan to use it. If you want to bring it with you on an RV trip, for example, make sure it's not too heavy for you to lift onto your rear e-bike rack by yourself. Top speed matters a lot depending on how you plan to use it. If you use it on mostly flat terrain, you'll probably hit the top speed with a moderate-sized rear hub motor like 300-500W, but if you go up a lot of hills, you need something with more torque, and a higher-watt output 500W-750W mid-drive motor will also help give you that extra torque you need to get up those steep hills. Compare mileage per charge.  If you are going into the backcountry, for instance, make sure to get a high amp-hour (AH) battery pack model as the higher the battery capacity, the farther you can go. You get a good workout, so be sure to get the accessories you need to hold a water bottle and some energy bars for longer rides. They're more fun than you'd expect! An e-bike is kinda like if a bicycle and a motorcycle had a baby, but it is all-electric and street-legal just like a regular bicycle. \r