I found dropped bars don't fold well. I went with upside down cut down drops . You get the hood and dropped position of drops, but not the top bars.
thus tends to fold really well. The Brompton folds as compact. The mezzo is about 3 inches wider. I could add a folding stage and get the mezzo flat but it's ok as it is.
I didn't like the SpeedTT bars position. I didn't feel safe at all.
on the mezzo I turned the drops through 90 degrees to make more compact drops, with less forward reach, than on the other two