We always buy the park hopper, 10 days, with no expiration and pluses (water parks, etc). For us, it works out well. At some point, I might decide to buy an AP.
We love to use EMH. For us, being from Cal., we rarely get to the a.m. ones (plus they are only 1 hour) but we almost always make the P.M. ones. If you're worried about the EMH park being more crowded, then, if you have a PH (are you listening DH

) you can go to one of the parks that isn't EMH that day, and then hop on over to the EMH park, later that day. It works well for us. And, if you have the PH, it's nice to be able to switch parks, if the crowds are more than you expected. Also, when we go (usually in Sept.) the parks close earlier. We use our PH to end our day at Epcot on the days MK closes earlier, or after AK, which always closes early. ( 5:00 in Sept).