ETH has the most development going on and that's ultimately more important than the blockchain itself. But it's not useable by most people right now. It's not a finished product. No crypto can really justify it's market cap with performance at this point. That's why people say we're still early - there is speculative value placed on cryptos that may or may not pan out.

With the ETH 2.0 roadmap, ETH has the best chance to be scalable and developer friendly.