What is the best app to buy Cardano?

Could you please enlighten me on the matter of cryptocurrency apps? Specifically, I'm interested in finding out which application is considered the most suitable for purchasing Cardano. Could you recommend one that offers a user-friendly interface, secure transactions, and competitive rates for purchasing this digital currency? It would also be helpful to know if there are any special features or advantages unique to this particular app that might make it stand out from the rest. I'm looking for a reliable and trustworthy platform to start my Cardano investment journey, so your insights would be greatly appreciated.