At that level, either would be fine. Get some decent brakes on them (the ones on my Dahon Mu SL were shocking – replaced with s/h XTR) and accept that you’re never going to do a TT on them, and you’ll be fine.
All depends on the usage though. Mine only gets foldes once a week if the train’s busy – the rest of the time I only use a folder because to carry a train in rush-hour it has to be capable of being folded. .
I didn’t like the Bromptons all that much to actually ride, though I accept that they have the best folding action. And to get a decent one that doesn’t weigh the earth you’re looking at £1k+