I've had good luck actually using the Brompton B bag and packing close around it for extra padding. It doesn't way much and with a hard case and a Brompton and current weight limits you are going to have too much free pounds to take actual gear besides the bike. As a plus the B bag can easily be put on the Brompton rack and ridden off. Not quite a slick as a Bike Friday suitcase setup but a lot less inconspicuous.
If you are doing a lot of long distance rides, I'd go with the Swift. The Bike Friday is pretty good too but the Swift has been an amazing bike for me. I am a big guy and it's been just amazing. I went with hub gears and a dual chainring up front. I have a great touring bike and an awesome city bike. The fold could be more compact but that is about it. Keep in mind the fold isn't terrible but it isn't Brompton compact.