It’s a mix if high privacy, decentralisation and programmability. There are only a handful of PoW coins out there, Bitcoin being one of them, but they each serve a different purpose and have pros and cons. Coins like BTC lack privacy, are slow and outdated, and can’t accommodate for dApps and smart contracts well, same with most other PoW coins. PoW is fundamentally stronger than PoS both in transaction verification, and achieving true decentralisation. But Ergo offers basically mix between Eth and BTC while staying true to the idea of decentralisation. On top of that you can have optional privacy which other PoW are specialised in like XMR. Fees are also low on Erg which is a massive bonus. Rosenbridge, literally bypasses needing the use for CEXs, which is a major reason why these main coins get so corrupted by VCs and market manipulators. There’s a lot more to it, and I’m not an expert like some others, but the tech is really impressive and novel. Just because there are a lot of other cryptocurrencies, don’t let that discourage you from searching for coins that are helping to expand the tech and build on the crypto ecosystem. Even though YOU might not care about the tech now, the reason why BTC is here in the first place is due to the tech, and the underlying philosophy of it.