Answer: Azure Traffic Manager
Explanation: Azure Front Door cannot handle TCP, only HTTP
Traffic Manager — Any protocol: Because Traffic Manager works at the DNS layer, you can route any type of network traffic; HTTP, TCP, UDP, etc.
Front Door — HTTP acceleration: With Front Door traffic is proxied at the Edge of Microsoft’s network. Because of this, HTTP(S) requests see latency and throughput improvements reducing latency for SSL negotiation and using hot connections from AFD to your application.