What are the key features to consider when choosing a 700c bike frame for optimal performance and comfort?

When choosing a 700c bike frame for optimal performance and comfort, key features to consider include frame material (such as aluminum, carbon fiber, or steel), frame geometry (like the size and shape of the frame), and the intended use of the bike (such as road cycling, commuting, or touring). Additionally, factors like weight, stiffness, and the ability to accommodate wider tires should also be taken into account for a comfortable and high-performing ride.