What is your favorite National Park?

As the title states, what is your favorite national park? Mine is a toss up between Zion and Arches for the ones that I have visited so far. Went to Bryce and Zion this past summer and both were awesome, but there was just something about Zion that left me wanting to go back. Arches was just so vast to me and I feel like I could spend weeks just exploring the different trails etc. also Moab just had such a cool vibe and is somewhere I will definitely be going back to in the near future.