[manigandham]

You can use both extensions on separate tables but they are not interoperable on the same table.

Timescale is limited to time-based partitioning on one node while Citus uses a master node with partitioning across multiple worker nodes. I don't see many situations why you would run both.

If you're just doing single-node time-series then use Timescale. If you have Citus then you can use the native partitions in 11 or pg_partman to add a secondary partitioning dimension.