Real world use. Legitimacy in working with existing systems, banks and governments, liquidity, need for higher total market cap to handle the billions transferred between fiat currencies every single day worldwide, and new customers added at increasing pace.
No matter what I say, it ends up with you depending on your risk tolerance. But I invest on projects that are backed by big money. Projects like Injective Protocol, a relatively newly discovered project for me as I only found out about them from browsing Medium and how they were promoting this $5k dollar ideation contest. (Google it) Point being, they are backed by Binance. So less chances of failure.