Decentralized oracles is a trend right now. How about Hathor? Would you create your own oracle solution or pick the oracle solutions that already exist?

Hathor has a basic oracle solution already working, when they were debating their initial ideas for Nano Contracts. They are not decentralized and rely on public/private key signatures.

The best way to move forward is enabling the user to choose from different oracles. So he may prefer to use decentralized ones, which are very popular now, or centralized ones, like Coinbase price oracle, based on the Compound open oracle model.