I think we should wait until
- EVM starts to support BLS signatures
- Polkadot starts to use BLS signatures
before we decide on what to chose as a common good bridge.
Polkadot is not even using Schnorr in its Light Client Bridges for Ethereum because it doesn’t support it. Instead we are using ecdsa. Which is good for compatibility but a bad choice overall.
I don’t know how the relations with Ethereum are but if there is way to support it, there is a good chance for Ethereum to start supporting BLS with Shanghai Upgrade.
Why Polkadot should use BLS in general?