Currently Segment has a somewhat decent connection from BigQuery to Braze, but Braze is implementing an API limit for most of their endpoints June 30th.
Especially 20k for users/identify.
I would expect the Airbyte implementation of this connection to be much better.
don't hesitate to ask Braze's team too. this would mean more data on Braze and therefore revenues for them, so they might be interested, and we'll happily feature their connector