You have standing offers from both? Kind of doesn't matter until you do. There are a number of differences between them--being big doesn't make them the same.

You have standing offers from both? Kind of doesn't matter until you do. There are a number of differences between them--being big doesn't make them the same. What kind of problems do you want to solve? Where are you willing to relocate to? What language(s) do you want to work in? Etc.