What Each Option Does
AtomicStryker Dynamic Lights is a dedicated moving-light mod. OptiFine is a broader graphics optimization and customization tool with its own optional dynamic-light functionality.
Loader and Version Differences
The referenced Dynamic Lights project lists Forge and NeoForge releases. OptiFine compatibility depends on its own release and your modded client.
Performance and Visual Behavior
Both approaches can affect performance, and visuals differ by implementation. Avoid enabling redundant features without testing.
Which Should You Choose?
Prefer the mod that matches your current Minecraft version, loader, other mods, and desired effects. Check both source pages for current support.
Download and compatibility reference
The Dynamic Lights author project page lists Forge and NeoForge files. The release file list is the best place to confirm exact compatibility. A direct file link is available from the homepage download section.