How to choose a FIWARE NGSI-LD context broker?

I need some help to decide which FIWARE context broker (Orion-LD, Scorpio, Stellio) I should choose for a smart city architecture. There is no existing component which uses NGSI-v2.

Is there any other reason why you should choose the Orion-LD context broker besides the fact that it is the only one that supports NGSI-v2?
Is there an advantage that the Orion broker is the main component of FIWARE?

The paper "Open-Source Publish-Subscribe Systems: A Comparative Study" says the scorpio broker is the most complete system overall.

The paper "Enabling Context-Aware Data Analytics in Smart Environments: An Open Source Reference Implementation" says the Orion-LD context broker is the most extended GE.

I also saw the performance comparison where Orion-LD is way faster at small batches of messages and slower than Scorpio and Stellio with larger batches.

Any suggestions?

Thanks!

My understanding is that Orion-LD is easy to operate, only the service and MongoDB. Scorpio uses Kafka which adds an extra complexity layer, operations-wise. I don't have any reference on Stellio.

Orion-LD supports NGSIv2 as it is a fork of Orion but it is not its main focus. If you are starting fresh, you can adopt directly LD, and you are done.