Ask HN: Homomorphic encryption, differential privacy – who does it best?

I've been digging into ways to better analyze sensitive data -- and I've started to see a few companies who are making great strides in this area (e.g., Duality Technologies). I've also heard that places like Google are developing hardware-signed custom homomorphic encryption that's relatively high performance.

Any tips on who is doing the best homomorphic encryption, differential privacy, secure multi-party computation (or other techniques) that are relatively high performance?