Guy Zyskind: „We determined it’s the right approach. TEEs, other than being blazing fast (hardware-based and not a pure software/cryptographic solution) allow everyone to extract value from secret contracts/encrypted computation immediately. There are less public parameters for developers to consider (which, like in choosing encryption parameters, requires some thought), and more importantly – it’s easier to fit to existing tools like Solidity, Web3, so there’s no learning curve for developers.
The advantage of MPC is that given the network model holds, it provides absolute cryptographic guarantees. That said, dApps are still so nascent that we expect it would take some time to see real production-level applications holding extremely sensitive data. By the time these are ready for prime-time, we should be out with Secret Contracts (2.0), giving them more choice to decide which engine they prefer."