Just standard 616 comic versions for both, no Phoenix for Jean and Thor has Mjolnir.
Obviously Thor is more powerful and he’d beat her in a regular fight, but if Jean is blood lusted, could she beat him with hax attacks? I saw an invisible woman vs Thor thread where the question was raised in the OP if she could beat Thor if she were willing to kill, with a bubble expanding in his head or lungs etc, so I was wondering if Jean could do the same. Could she kill him by Cushing his heart or his brain with her telekinesis? Could she shut down his mind with telepathy? Etc.
Sorry if this has been done before, but the results I found were for Phoenix Jean and movie versions.