I picked both as we ended up with 2 days to spend at MK.
When we only had 1 day at MK - we choose Crystal Place for the same reasons as the PP stated. So many DIS'ers suggested it when I asked, and now I'm really looking forward to it. I can hardly wait for that early walk through the park and to quickly be at Dumbo just after rope drop.
When we ended up being able to have a 2nd day at MK, I choose 1900 Park Fare with a later breakfast time. We plan to sleep in and take our time that morning. Then finish the rest of MK and enjoy the evening back at Dig Site.