It's probably not the song itself that makes Venus a better choice for the second single as it is the fact that the "Venus era" was actually planned, even if in the slightest. Everything about DWUW was a total mess because it was always meant to be an irrelevant promo single until it was hastily released as a single instead of Venus. Gaga also preferred Venus to DWUW and was given a short time frame to come up with the video for DWUW, which probably made her pretty reluctant to promote it. Then people started betraying her and we didn't hear from her in forever and never got a video.
I can't see why you would still prefer DWUW as the second single. Everyone knows that it killed ARTPOP.
