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The alternative to the Brompton rack is really attractive, I wish it was available when I bought my one. That said if you intend to carry stuff with it (something I wanted the possibility of, as well as the improved rolling when folded) the Brompton has the advantage of being longer to the rear. This is important as loading towards the front is an issue if what you carrying is wide, as your heel will kick it when pedaling. With the Brompton rack you can fit the wider stuff to the back, the alternative restrict you too narrow loads only.
Pros/cons of the RJT rack vs the Brommie own one? Does it make the bike as stable folded? Looks like it's a fair bit lighter, but will need to buy easy wheels, and it doesn't have an obvious place to mount a light/reflector?