brompton, simple as – had mine for nearly 5 years now
I test rode, airnimals, , bike friday tickit, birdy, dahon, giant, etc folders.. before going for a B
folders are a compromise – brompton is the best compromise.
bromptons pack down smallest, stand up on their own when folded, dahon owners always seem to be bunging their bikes to trains, brompton luggage system works very well, when you have an issue, Brompton are very helpful and sort it out quickly..
being honest some bits of the B are a bit cheap…and have replaced quite a lot due to wear and breakage – but it is used everyday
also re dahon the 20" wheels ones ride nice (P8, speed pro etc are nice), 16" ones terrible