Agree with both Alvin and Mark, it's a very broad topic and depend what exactly you need/want and on that note, here is a quick link which might interest you.. https://manishmehmood.wordpress.com/2019/06/24/sdl-tridion-sites-vs-aem-vs-sitecore-which-one-is-better/

Agree with both Alvin and Mark, it's a very broad topic and depends on what exactly you need/want "Know Your Needs" and on that note, here is a quick link which might interest you.. https://manishmehmood.wordpress.com/2019/06/24/sdl-tridion-sites-vs-aem-vs-sitecore-which-one-is-better/