FWIW, the React app I would be using Webpack for (currently using Browserify and Babel) doesn't actually do any server/browser checks, the entire difference is

FWIW, the React app I would be using Webpack for (currently using Browserify and Babel) doesn't actually do any server/browser checks, the entire difference is handled via two different entry points and a few module swaps for browserify in my package.json file.