Thank you for your answer. For me the main difference boils down to governance and thus safety and sustainability of the whole network. While Steem is being run by Justin Sun and his servant-witnessess it's basically centralized database vulnarable to moods of the owner, Hive presents different model, witnessess are elected organically among community members. This provides decentralized model which is superior and more secure in the long run. Except of this there are minor changes in curation and finances, like 10% APR on HBD which is designed to be stablecoin. Find it for yourself:) Enjoy your journey!