Amazon S3 or Amazon Simple Storage Service is a service offered by Amazon Web Services (AWS) that provides object storage through a web service interface. Amazon S3 uses the same scalable storage infrastructure that Amazon.com uses to run its global e-commerce network. Amazon S3 can be employed to store any type of object, which allows for uses like storage for Internet applications, backup and recovery, disaster recovery, data archives, data lakes for analytics, and hybrid cloud storage.

Google Cloud Storage is a RESTful online file storage web service for storing and accessing data on Google Cloud Platform infrastructure. The service combines the performance and scalability of Google's cloud with advanced security and sharing capabilities. It is an Infrastructure as a Service (IaaS), comparable to Amazon S3 online storage service. Google Cloud Storage offers four storage classes, identical in throughput, latency and durability.

*Pricing varies according to region, all of the prices displayed here are for the US East (Virginia)

Tiers

AWS Free Tier - 5GB of storage, , 20k GET requests, 20k PUT, COPY, LIST or POST requests, 15 GB of Data Transfer Out monthly.

S3 Standard - General purpose storage for any type of data, typically used for frequently accessed data

S3 Intelligent - Tiering - Automatic cost savings for data with unknown or changing access patterns

S3 Glacier - For long-term backups and archives with retrieval option from 1 minute to 12 hours

Example Price

Using the S3 Standard, 100GB storage ($2,3) 100k PUT requests ($0,50), 100k SELECT requests ($0,50) $3,2 USD

Google Cloud includes a calculator for pricing for those who are interested. Prices may vary according to region.

​Click Here to be directed to the calculator.

Onboarding

Wide documentation with tutorials.

Scalability

Automatically done utilizing serverless technology.

Regions

United States, Africa, Asia Pacific, China, Europe, South America, Middle East.

Backups

All the AWS Backup Storage options, which includes Object Storage, Hybrid Storage, Networking and more.

Security

PlanetScale is SOC 2 Type II compliant. All data is stored encrypted at rest throughout the PlanetScale platform. This helps mitigate the risk of unintentional or malicious 

Onboarding
Great documentation with plenty of tutorials and help to quickstart things off.

Scalability
Includes autoscaling.

Regions
North and South America, Europe, Asia and Australia.

Backups 
Google Cloud offers two primary backup options:

NearLine Storage
This option is intended for data that users need to access no more than once per month, for example backups and multimedia content only occasionally accessed by users.

ColdLine Storage
This option is for data that can be accessed no more than once per year (for example, disaster recovery backups of key systems), or possibly not at all (for example data held for compliance reasons).

Security
All Cloud Storage data are automatically stored in an encrypted state, but you can also provide your own encryption keys. For more information, see Cloud Storage Encryption. Gsutil performs all operations using transport-layer encryption (HTTPS), to protect against data leakage over shared network links.

Amazon S3 has various features you can use to organize and manage your data in ways that support specific use cases, enable cost efficiencies, enforce security, and meet compliance requirements.

• ​Storage management and monitoring
  
• Storage analytics and insights
  
• Access management and security
  
• Access management and security
  
• S3 Object Lambda
  
• Query in place
  

Google Cloud Storage offers four storage classes, identical in throughput, latency and durability. The four classes, Multi-Regional Storage, Regional Storage, Nearline Storage, and Coldline Storage, differ in their pricing, minimum storage durations, and availability.

• ​Interoperability - Google Cloud Storage is interoperable with other cloud storage tools and libraries that work with services such as Amazon S3 and Eucalyptus Systems.
  
• Consistency - Upload operations to Google Cloud Storage are atomic, providing strong read-after-write consistency for all upload operations.
  
• Access Control - Google Cloud Storage uses access control lists (ACLs) to manage object and bucket access. An ACL consists of one or more entries, each granting a specific permission to a scope. Permissions define what someone can do with an object or bucket (for example, READ or WRITE). Scopes define who the permission applies to. For example, a specific user or a group of users (such as Google account email addresses, Google Apps domain, public access, etc.)
  
• Resumable Uploads - Google Cloud Storage provides a resumable data transfer feature that allows users to resume upload operations after a communication failure has interrupted the flow of data.