Use them together! Apply Saber to create the core energy beam, and then apply Deep Glow on top of it (or on an adjustment layer above it) to add the atmospheric bloom that makes the beam feel like it is illuminating the air around it.
The plugin (Plugin Everything) eliminates the two biggest headaches of motion design: render artifacts (banding) and unrealistic light decay. While you can spend 20 minutes building a native stack of blurs and curves to simulate it, the plugin does it instantly, with better color science, and renders faster. after effects deep glow