It is hard to say which one is best but it is easy to get. I have my own cryptocurrency exchange which works great and it has a considerable number of users. Launching a crypto exchange has now become a way to establish yourself in the emerging cryptosphere. All you need is a cryptocurrency exchange developer who can give you a perfect platform. I got my exchange developed from Technoloader which provided me an entire team of developers who worked together and delivered a flawless exchange that works on the blockchain.
They also took care of the marketing and my exchange got a great start. If you also want to make a successful bid in this domain, then get your own crypto exchange software. You can also have a security token exchange platform which would garner more users in the future.