The Brompton and Tikit are very different bikes. One aspect that has not been discussed is parts availability. Here in the UK dealers like http://www.sjscycles.co.uk/category-Brompton-766.htm can supply any part for a Brompton that I might need within a day or two.

I do like some of the Bike Friday models (BF Pocket Llama) but there are very few BF dealers in the UK and who knows how long the wait would be for a BF specific part?