Bitcoin is decentralized, censorship resistance and beyond institutional control which makes it very unique from altcoins. Bitcoin scalability is also another important aspect of bitcoin. It's an open source which has given more people the opportunity to dive into the network to make it more secured and reliable to invest into. POW helps in security and decentralization.
That features are I think what people really like including me though I am not as technical as others but the idea of decentralization is the best thing that has ever invented in favor to those who holds Bitcoin because no one is above the system it run.