srw
It's a bit more complicated than that...
I have both a Trek (a Dahon with a different badge on it) and a Brompton. The difference between the two is like the difference between a Trabant and a Skoda. Neither is exactly fashionable, but one just makes you feel good about being on it. The only advantage to the Trek is that I'm willing to leave it locked up outside - in 17 years of Brompton ownership I have never ever left it unattended in a public place.