1. Bitcoin is scarce
2. Bitcoin is decentralized
The biggest reason why Bitcoin will always remain valuable is its decentralized structure. Bitcoin laid the foundations for a new understanding and has been moving forward ever since. We've been lucky to witness this progress.
The biggest problem with today's economies is that they print money at will, and this free money comes back as inflation. This is not the case with Bitcoin. That's one of the things that makes Bitcoin valuable.
Yes decentralization of BTC makes it different from other asset and no other payment method/asset could he competitive of BTC. some other benefits of decentralization is no one controlling BTC price and we are totally free from Government manipulation.
Another big benefits which i think added value to btc is global access with ease and buying/selling (trading) will not charge extra fee and not limited to specific regions and we can send money to other countries cheaply with fast speed. These all are the benefits of decentralization. I. shorts decentralization is main key points i think more valuable then any asset.