I'm thinking about trying Apple TV, but I'm not sure if it's worth it. I don't have a big TV or projector at home, just a regular laptop and phone. So I was wondering, does the quality of Apple TV depend on the device you watch movies on? I just don't want to subscribe to this service and then feel like I'm missing out because I'm watching on my phone. What do you think?

I think you're worrying for nothing. At first, I also watched on my phone, and that was enough for me. However, when I switched to a bigger screen with Apple TV, the movies were much brighter and more immersive. You can see what's available and how everything looks on different devices at https://tv.apple.com/. Even if you're watching on your phone, the quality and visual effects are still very good. In particular, I also watch on my phone when I'm on the road and don't see a problem with that. As an option, you can try connecting your account to a TV or monitor to see the difference.