erlang_python embeds Python with true parallelism via sub-interpreters (each with its own GIL) or free-threading (no GIL). You get bidirectional communication: channels, async/await, and Python calling back into Erlang. Pythonx is designed for Livebook/Elixir with a single Python interpreter and shared GIL, which is enough for notebooks but limited for concurrent production workloads.
Afaik erlang_python is built to run Python applications inside the Erlang VM and inherit its efficiency.
