Compared: App Engine Standard & Flexible Environments

Comparison of  App Engine Standard & Flexible environments from the Google Cloud documentation -
Feature Flexible environment Standard environment
Instance startup time Minutes Seconds
Maximum request timeout 60 minutes 60 seconds
Background threads Yes Yes, with restrictions
Background processes Yes No
SSH debugging Yes No
Scaling Manual, Automatic Manual, Basic, Automatic
Scale to zero No, minimum 1 instance Yes
Writing to local disk Yes, ephemeral (disk initialized on each VM startup) No
Modifying the runtime Yes (through Dockerfile) No
Automatic in-place security patches Yes (excludes container image runtime) Yes
Network access Yes Node.js, Python 3, PHP 7.2, Go 1.11: Yes.
Python, Go, and PHP (billing-enabled): Only via App Engine services (includes outbound sockets).
Supports installing third-party binaries Yes No
Location North America, Asia Pacific, or Europe North America, Asia Pacific, or Europe
Pricing Based on usage of vCPU, memory, and persistent disks Based on instance hours
Environment Application instances run within Docker containers on Compute Engine virtual machines (VM). Application instances run in a sandbox, using the runtime environment of a supported language listed below.
Optimal usage Applications with the following characteristics:

* Source code that is written in a version of any of the supported programming languages:
Python, Java, Node.js, Go, Ruby, PHP, or .NET

* Runs in a Docker container that includes a custom runtime or source code written in other programming languages.

* Depends on other software, including operating system packages such as imagemagick, ffmpeg, libgit2, or others through apt-get.

* Uses or depends on frameworks that include native code.

* Accesses the resources or services of your Cloud Platform project that reside in the Compute Engine network.

* Applications that receive consistent traffic, experience regular traffic fluctuations, or meet the parameters for scaling up and down gradually.		 Applications with the following characteristics:

* Source code is written in specific versions of the supported programming languages:
Python 2.7, Python 3.7 (beta)
Java 8, Java 7
Node.js 8 (beta)
PHP 5.5, PHP 7.2 (beta)
Go 1.6, 1.8, 1.9, and Go 1.11 (beta)

* Intended to run for free or at very low cost, where you pay only for what you need and when you need it. For example, your application can scale to 0 instances when there is no traffic.

* Applications that need to deal with rapid scaling...which experiences sudden and extreme spikes of traffic which require immediate scaling.

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