Honestly, this is a toss up for me. I religiously use both brands. I love both. They've both stayed put on my waterline and have lasted all day. Both are very pigmented. As far as application goes though, I think that UD applies more smoothly. It really does glide. You really can't go wrong with either.
For further lasting power. Before applying it. Swipe a Qtip on the waterline to soak up excess moisture. Then apply the eyeliner. Try not to blink for a few seconds to allow it to set. I do this all the time and it doesn't budge