As a fellow mobile developer, I highly prefer Android's non-visual option with human-readable and -editable XML. I always find myself editing layouts textually and then just using the visual editor to preview how things look.

Interface Builder was great for me at first, when learning iOS-specific controls and how everything worked, but as I've gotten better I've found it's always more of a hindrance. Things really start to break down when you need to move fully laid-out controls to a new container, for example, whereas Android's XML layouts let me do that by deleting/changing a few lines of text.