When comparing OmniDB vs SQL Workbench/J, the Slant community recommends OmniDB for most people. In the question“What are the best GUI tools for PostgreSQL on Windows?” OmniDB is ranked 4th while SQL Workbench/J is ranked 12th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Open source and actively developed
Pro PL/pgSQL Debugger
Pro Web-based, can be run locally or deployed on server
OmniDB is web-based and works similarly to pgAdmin 4. You can run the web server locally or deploy it on a server, and connect to it through a web browser.
Pro Multi-database
Supports PostgreSQL, Oracle, MySQL and MariaDB, with support in the pipeline for Firebird, SQLite, SQL Server and DB2.
Pro Simple and intuitive interface for everyone.
An easy-to-discover tree panel to classify features/objects on left (with context menus if you don't know what you're doing). Tabs panels for ins and outs on right. That's it.
Pro OmniDB has 2ndQuadrant as its main sponsor
Pro Allows you to edit changes before they are executed.
Any changes to the database generate SQL statements that you can review and edit before running.
Pro Works with almost any SQL database
Can work with any database with a jdbc driver.
Pro Can edit data in table mode.
Easy to make changes when viewing data.