We just integrated launchdarkly recently and I like it, they provide multiple flag types that I haven't seen on other services, the main one being migration flags (can be either 2, 4, or 6 step migrations) that allow you to control the migration from one system to the other.
It's been pretty helpful for us moving our analytics queries from mongoDB to clickhouse.
It's been pretty helpful for us moving our analytics queries from mongoDB to clickhouse.