Using both Sharpen AI and Gigapixel AI

Is I have an old film image that I would like to use both Gigapixel AI to increase size (say 2-3X) and Sharpen AI to make it sharper. Is it optimal to use Gigapixel first, or Sharpen first? Does it matter?

It would be better to use GigaPixel first as you will then be working on the final image to add any processing.