I assume you’re talking about Windows. I like Foxit Reader, I use the Android version on my tablet. Sumatra is popular. I used Nitro PDF Reader (and Pro, the PDF editor) at a previous job, and it did fine.
But are they “better”? It’s debatable. Adobe Reader is the standard for a reason. Honestly, I dislike many things about Adobe as s software company and I hate their latest iterations of some of my favorite software (particularly Dreamweaver and Photoshop). But even still I can’t wean myself off of Adobe Reader on my home machine. Other products seem to have quirks here and there (particularly with printing) and I just stay with Adobe.
Mac OS X has had a native PDF reader since its first version if I remember right (I was a beta tester for it when it came out) so you don’t need Adobe Reader on a Mac. Windows 8 and 10 come with a Microsoft-made PDF reader app so you don’t technically need anything after Windows 7. (But I hate that app and you might too.)
Try various products and stick with what you like. They’re all free and the best one is subjective.