When I looked at the website there wasn't a lot opened for evening EMH. It said the safari and few other attractions were morning only. We plan to go during the day and stay for evening EMH. We've never been so we'll probably end up doing everything which will take all day.
I wouldn't mind doing the EMH at AK. I think it would be a bit more tranquil where you could really take in all the sites and sounds of nature. It would be just a different perspective of the park.
We did it last May I believe. An hour or so after the Park's official closing time it was almost like we had the place to ourselves. Walking the path along Expedition Everest we didn't see anyone else. A nice change from having thousands of people around. We did a few attractions but mainly just enjoyed the relative quiet of the Park after hours.