Comparison of Azure Front Door, Traffic Manager, Application Gateway & Load Balancer

With the introduction of Azure Front Door, the official documentation has new guidance [compare with old] on load balancing options and a decision tree -

Options   Azure Front Door Traffic Manager  Application Gateway  Azure Load Balancer 
 DescriptionOffers Layer 7 capabilities for your application like SSL offload, path-based routing, fast failover, caching, etc. to improve performance and high-availability of your applications. DNS-based load-balancing service that operates only at the domain level. For that reason, it can't fail over as quickly as Front Door, because of common challenges around DNS caching and systems not honoring DNS TTLs.  Provides application delivery controller (ADC) as a service, offering various Layer 7 load-balancing capabilities. Zone-redundant, high-performance, low-latency Layer 4 load-balancing service (inbound and outbound) for all UDP and TCP protocols. 
Global/regional  Global  Global  Regional  Regional
Recommended traffic

  HTTP(S)  non-HTTP(S)  HTTP(S)  non-HTTP(S)
 SLA  99.99%  99.99%  99.95%  99.99%
You only need routing (performance- or geography-based) and high availability Suitable
You need SSL termination (also called SSL offloading)  Suitable Suitable
You need application layer features like URL rewriting
and WAF 		 Suitable Suitable

Related: Compared: Azure Load Balancer, Application Gateway, Traffic Manager

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