I believe games should be created for browsers first, rather than mobile. The mobile market is full of cookie-cutter games packed with microtransactions, especially compared to browser games.
Historically, games were originally developed for browsers before mobile, making them exclusive to the browser in the early days. Browser-based games can offer many features that mobile games cannot. I also think PC games have a larger market than mobile games, making them a better option for developers who want to reach a broader audience.