Are there differences between the privacy models of cipher and sapphire, or is the only difference the programming language? The cipher repo does not seem to be very active compared to sapphire. Is the plan to focus on sapphire?
The differences are in smart contract language, and they use the same ParaTime features to handle encrypted transactions and sealed state. Cipher has easier support for declaring a public state though, so watch out for that. Focus on sapphire is consistent.