II'm more comfortable on my Curl than I was on the Brompton only because I've adjusted the Curl to fit me, and I just got what I could rent with that Brompton. If I owned a Brompton, I could use my favorite saddle and get the handlebar height just right.
I am musing the possibility of getting the Curl Ei4, which is available in the US. It has a lot I like. I may contact Dahon and see if a test ride is possible. I don't like that a front bag option may be off the table due to its design. It has 48–305 tires as its source of suspension. That may be enough for me. I have never owned a bike with 305 tires.