That's a good comparison, and I think I should qualify my statement. It's the fastest way to develop cross-platform apps when you already know web development. I've only done some trivial apps with QT and Python, and it was pretty straight forward. The UI didn't look as nice as it does with Electron. I'd be interested to hear someone's opinion who has real experience with both.

edit: u/781 has some experience with both and says Electron was faster to develop, his comment is below: https://news.ycombinator.com/item?id=19652691