What is the difference between THETA and Tfuel?

Could you elaborate on the key distinctions between THETA and Tfuel within the cryptocurrency and decentralized video streaming context? I'm particularly interested in understanding how these two tokens function differently within the Theta Network. Does THETA have a primary role in governance and staking, while Tfuel serves as the utility token for transaction fees and resource allocation? Are there any significant economic incentives or use cases that differentiate them? Additionally, how do their market performances and valuations differ? Thank you for clarifying these points.