As a long-time Brompton rider I was so struck by this video showing the Tikit being packed to go in a suitcase.

For me, this illustrates an important difference, so sorry Folder Fanatic, I'm going to disagree on the ease of getting the Bike Friday into a suitcase.

As has been previously mentioned the rolling ability of the Brompton is enhanced when it has the rack & wheels fitted (this also pushes up the weight... obviously)

Thank you for starting this thread SC, we've needed to put some numbers to this for a while. Another good criteria to compare the 2 brands would be on costs initial/ongoing & support from dealers/distributors.