I am working on following architecture. We are following hub and spoke topologies We are looking at having two Application Gateways (1 in the Hub and 1 in the Lab) a. They really need an App Gateway in the HUB? b. And Whether customer can consider having may be Azure Front Door in replacement for the App Gateway. Has anyone done any critical research around this, any case studies or reference Architecture on the same? Any thought?

Application Gateway vs Front Door

I am working on following architecture.

We are following hub and spoke topologies
We are looking at having two Application Gateways (1 in the Hub and 1 in the Lab)
a. They really need an App Gateway in the HUB?
b. And Whether customer can consider having may be Azure Front Door in replacement for the App Gateway.
Has anyone done any critical research around this, any case studies or reference Architecture on the same? Any thought?