|thanks to www.swandolphin.com for the image|
I guess there are two thoughts about EMH: 1) Go to the park offering EMH and 2) Don't go to the park offering EMH! Some people believe that the EMH parks are busier on those days because everyone staying at the resort goes to that particular park. I have not found that to be the case when I've visited the parks. But, if you have park hopper passes, you can hop to the park with morning EMH, hop to another park during the day for lower crowds, then hop to another park with evening EMH! Play the system, if you like, and take FULL advantage of your park hopper option!
I particularly like the morning EMH because a lot of people sleep in on vacation and aren't willing to get up that early and it tends to be cooler in the mornings. But, I also like the evening EMH for the same reason! The sun is down, so it's not as hot. Towards the end of the evening EMH the park has cleared out quite a bit since people are worn out from the long day at the parks and are ready to hit the sack to prepare for the next day's adventures!