Compared: Google Cloud Platform Load Balancing options

Google Cloud Load Balancer is a fully distributed, software defined, managed service that can respond to over 1 million queries per second.

Consider the following aspects of Cloud Load Balancing for choosing the appropriate option:
* Global versus regional load balancing
* External versus internal load balancing
* Traffic type

Load balancer	Traffic type	Global/Regional	External/Internal	External Ports for Load Balancing
HTTP(S)	HTTP or HTTPS	Global	External	HTTP on 80 or 8080; HTTPS on 443
SSL Proxy	TCP with SSL offload	Global	External	25, 43, 110, 143, 195, 443, 465, 587, 700, 993, 995, 1883, and 5222
TCP Proxy	TCP without SSL offload. Does not preserve client IP addresses	Global	External	25, 43, 110, 143, 195, 443, 465, 587, 700, 993, 995, 1883, 5222
Network TCP/UDP	TCP/UDP without SSL offload. Preserves client IP addresses.	Regional	External	Any
Internal TCP/UDP	TCP or UDP	Regional	Internal	Any

Source - official Google Cloud documentation