Went back and thought about why I liked #1 more than #2. It's a challenge to put into words something that is a visceral impression. But let me try.
The structural elements in #1 are not as apparent, and the various horizontal bracing beams make for a visual feast – but one that makes you stop and try to figure how everything is related. #2 has one of the support beams clearly visible, and diminished the "mystery" of #1.
#1 has the windows to the outside visible, giving an airy, open feeling, whereas #2 feels like an enclosed space.
The transition of bright/shadow areas are more subtle in #1 compared to #2, where you see blotches of bright sunlight interspered with the window shadows.
The distribution of elements is more even in #1 compared to #2.
So summing up, #1 has better shadow play, more "mystery", and more feeling of openness, and some better visual balance. But that's just my take. Did that make sense?