Is PBX better than VoIP?

I'm curious to understand the differences between PBX and VoIP and why some businesses may choose one over the other. Can you explain the benefits and drawbacks of each system? Additionally, how do they compare in terms of cost, scalability, and reliability? Are there any specific industries or use cases where one system is clearly superior to the other? I'm looking to make an informed decision for my business, so any insights you can provide would be greatly appreciated.