In which area? It depends a lot on the equation to figure ratio. If you have many equations, LaTeX is better. If you have many graphics, Word is better.
I still use PowerPoint for slides for Math talks. Adding equations is painful, so you are encouraged to add as few as possible. In LaTeX adding graphics in the right position, with the right side, ... is painful, so people prefer to cover the slide with equations. Also, in PowerPoint is easier to add a color arrows here and there, so you can connect a random equation with a random part of the graphic. I used tikz and xypic and other packages in LaTeX but I never was able to get enough fine control of random arrows.
I still use PowerPoint for slides for Math talks. Adding equations is painful, so you are encouraged to add as few as possible. In LaTeX adding graphics in the right position, with the right side, ... is painful, so people prefer to cover the slide with equations. Also, in PowerPoint is easier to add a color arrows here and there, so you can connect a random equation with a random part of the graphic. I used tikz and xypic and other packages in LaTeX but I never was able to get enough fine control of random arrows.