What is the best coin exchange in the US?

Can you provide some insight into what constitutes the best coin exchange in the United States? Are there specific factors we should consider, such as fees, security, and ease of use? How do the major exchanges in the US compare to each other in terms of these factors? Are there any upcoming exchanges that show promise as potential contenders for the top spot? And ultimately, what are your thoughts on which exchange would be the best choice for the average cryptocurrency investor in the US?