When comparing Adminer vs OmniDB, 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 Adminer is ranked 17th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Lightweight
The installation and Adminer itself only requires a single PHP file. Once it's uploaded you can log in and start using it.
Pro Supports more than MySQL
It supports several database management systems (Postgres, SQLite, Oracle, MS SQL and of course MySQL).
Pro Database views
Anyone who uses the views function will appreciate Adminer better. You can click on a view and edit to change the view. In phpMyAdmin, you can edit a view, but it's not easy or intuitive. SQL Buddy doesn't have any way of doing this.
Pro Themes
Has a great variety of themes which transfers pretty ugly application into a great looking one.
Pro Installation
No need to install, it's available to use out of the box.
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
Cons
Con Bulk edition problems
