Pics courtesy of Soyokaze-sakky, Japan
There is no question in my mind that the best 16" folders are the Bike Friday Tikit and the Brompton. Which one is better has been a source of endless debates (warning - click only if you lots of time to spare).
The better one really depends on what your priorities are. If having the absolutely most compact package is critical, eg you drive a Smart car and the boot can only fit the Brompton, then choose the Brompton. But if this is not that important and you much prefer a better ride and performance, and perhaps even light touring, choose the Tikit.
Anatoly did a pretty objective comparision review and is worth a read. He chose a Brompton because of his requirements. I choose both!
ps: Sean Luke's excellent review is also a must read.