Here is a base of Napoleon at War figures next to a base of Blue moon. You can clearly see the size difference.
Here are some Blue Moon figures with Essex figures out front as the skirmishers. Again, lovely figures and really easy to paint.
I won't say one is better than the other as they are both nice figure makes. The problem is I'd started collecting figures long before Napoleon at War (N@W) started releasing figures so most of my collection looks small next to them. If I was starting from scratch I'd certainly consider the N@W figures but i do like to use a range of manufacturers so I'm not sure I will get many more N@W figures. It's a shame though.