In short Polkadot has a high supply of tokens and has still reached $AUD40. It is a chain of multiple chains that can link into any block chain. It has cheap fees and a great system which allows communities to start up their own block chain with their own dedicated "road" reducing congestion. Fees are paid in that parachains tokens and at the end it meets polkadots main chain to save transactions. But the low fees and parachains enables polkadot not to receive congestion.

Unlike Ethereum requiring votes to make change Polkadot can upgrade and make change. Noting Hive requires hard forks for its major changes it is done and decided by witnesses I believe?

Hive is moving into the realm of a great interoperabile block chain with low fees and reduced traffic. It kinda has its own parachains and can establish witnesses relatively easily as it grows.

I'm not fully across it all but the changes being discussed are similar to what polkadot is trying to achieve with many devs and investors flocking to it over Ethereum.

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