Just MySQL, done properly: schema, rows, real SQL with syntax highlighting, query history and SSH tunnels — on iPhone, iPad and Mac.
Everything here assumes MySQL. There is no engine chooser on the new connection screen, no fields that only matter to some other database, nothing to skip past. If MySQL is the only thing you run, every choice the other apps offer you is a choice you did not need to make.
Every single-engine app costs the same, and each one is bought separately. The Mac apps cost more because they do more — editing, CSV export and the full SQL editor.