Smaller people are usually better with shorter reach - I found the reach on the brompton, regardless of handlebar, too far for me (my friends say I have t-rex arms, lol). I'm much more leg than torso. On a bike where you would probably be quite upright, I am riding at a 55 degree angle! OP mentions she is "pretty short" so for her, a smaller wheel bike with shorter reach might be fine. Also, she's considering a Bike Friday pakiT as well, which can easily be 10 pounds lighter than that brompton/dahon 20". Mine is just 19lbs and I didn't opt for the lightest components, more mid-range, to get that weight (which includes saddle/pedals, etc.). That's a massive difference in carrying weight.
I'm confused by your comments as you said "weight doesn't matter" in one post and now you seem to acknowledge that it does matter to the OP, which is what we should be talking about.