You mean another bike that is delayed for years would be very welcome in this thread? To me the biggest difference between a Brompton and a Helix is not their wheel size or frame material. The biggest difference is that the Brompton actually exists. Beyond that, all comparison is hypothetical. It's like comparing your spouse to some movie character. The movie character might seem way better looking, they own a big house, can do kung fu, etc. ... . But one is real and one is not.