User: First you'd need to consider what you're using it for. Exercise bikes can be very different from commuters or casual ride bikes or velodrome racers. Another consideration is budget: bikes can range from a couple hundred dollars in price to several thousand. Accessories can dramatically increase the price as well.

For general, all-purpose bikes you may want to consider a commuter bicycle. It would have a wider, thicker wheel than a road bike so it would be a little sturdier for urban roads. They tend to be a bit heavier, so there is a tradeoff.
Assistant: There isn't any one bicycle that would be ideal for all people. Bike shops have experts who can advise the right model and size for you and your main uses. You could also look at product results from online bike shops and read reviews to supplement the advice from the shop. A meetup or ride with a local cycling group would be another great source of advice and targeted knowledge for making a decision which bike is right for you.