In my preference headcanon Anakin takes the form of a visibly aged-up Hayden Christensen, mostly because of my stick-to-continuity approach, but I don’t really like the SE version of Hayden in ROTJ. He looks creepy and detached from the other characters in the scene.
I’d say keep SE Hayden for the moment, but hopefully it won’t be long before we have a seamless, “jonh-level” quality rendering of a Hayden-based Anakin force spirit.