Both have their ups and downs as far as the landscape. I hate the Capital Wasteland due to all the wreckage. It takes forever to find a pathway or a way to get through for me. I remember trying to get to the area for the Operation Anchorage DLC and it took me forever on how to get into the fucking location since it was blocked off on all sides except one with no specific path shown.
If this hasn't been touched on, I'm posting it:
Sucks for me, as I have all the DLC already minus the two weapons related ones (Gunrunner's Arsenal and Courier's Stash).