I voted for Dead Palace for these reasons:
The whole water rising feature made the map more challenging and actually made you think about whether to continue looking for stuff in area you were in or continue higher, done better than CCU did it. Detail was done nicely on the map and targets part was fun, especially bridge target. UGX mod imo didnt make the map worse like some people think and neither did Blunts soulboxes. Out of all the maps I played, this was the map I was most impressed with and for a 1st map from Riptide, this map deserved my vote