I think both attacks look quite good!
The only thing I can see is that in each swing, the weapon feels like it has a different weight. In the side swipe, it feels light and agile, in the top down one, it feels heavy. I like the heavy look though, so if you do anything on this front, maybe make the side swipe a little weightier.
Also, I tried to edit the gif a bit, but it seems to be made of deltas or something, so it looked mangled.