How do I decide which platform is right for my application?
The platform that you'd want depends on the resources and complexity that your application demands. The solutions based on ADAU1467 and ADAU1452 are SigmaDSP based and can handle Single Channel AEC, Noise Reduction and Beamformer, all together and still have capability to add a few more processing modules. This would serve most applications.
For few high end applications like conferencing systems, voice UI, etc., where multichannel AEC or Microsoft Teams Certification would be necessary, the ADSP-21569 based solution would be the most suitable platform.
Refer to the FAQ to understand the available resources. You can also refer to the UG/Datasheet of the products to understand the resources.