Please add the size of your tikit. Likewise, do you have an extended/normal seatpost on the Brompton?

I am surprised to see the Tikit weight 28#. Their website states 21.5# (w/out pedals/saddles) + Brooks 1.5# + additional 1.5# for pedals + the bottlecage? What else do you have on the bike?

Would you also mention speed of the ride? When you need to be somewhere in 15 minutes not 20 or when you're feeling a little tired and want a little easier ride to the pub, which bike do you take out?
I assume the Tikit would win although if the Brompton is a little lighter, and you had S-Bars, perhaps...

Also Air Travel; if you're going away for a week's vacation, which bike do you take?

Errands; if you have to drop in and buy some eggs/butter, do you have any preference?

Bad weather (rainy/cold etc)

Bad roads any preference?

Yes, I'm nitpicking, but since you've got both bikes, let's hear it!