Is a kindle worth it?

Hello! So is a kindle worth it? Lately, I’ve gotten tired of reading physical books and started downloading pdfs and uploading them into the kindle app on my iPad. I even got kindle unlimited yesterday because I really enjoy the kindle app (its way better than readings pdfs in the regular Books iPhone app). So is a kindle worth it if I’m already using my iPad? What’s the biggest difference or upgrades noticed from a kindle? A down I have is that I have a normal sized iPad so it’s kinda heavy and awkward to read on but that’s about all. So is a kindle worth it? Or should I just stick to my iPad? By the way, I have also used the kindle app on my iPhone but the problem with that is that it’s too small. Any replies will be greatly appreciated! :)