I like the bottom one the best. Mainly because the tree frames the left side of the photo better. Although I like the upper right corner of the top one. What about cropping by closing in closer to the tree on the left side and showing a little bit more of the shore by the bridge on the right side ?
I really like the photo, nice colors and interesting subject. The line of umbrellas leads your eye right along the river to the bridge, very pleasing composition.
After looking at the two images a little more, the top one looks best to me now, it has a more spacious flowing feeling, the 2nd one could seem a little cramped.
Really like the photo !