I am in the process of buying clickfix to be able to use the same bags/baskets on most of my bikes. I am sure both are ok but sometimes you want THAT bag or THAT basket and let that decide (like me on the Brooks front basket..).
Also I would prefer something where I could walk into a lokal shop and buy.
I like the Dahon front mount seen on the Basil sites since it is not sticking out so much. Closer to the frame allows for more weight in the bag.
I am planning to butcher a Brompton bag frame and a Clickfix bracket and join them on an alu sheet to be able to swap bags. Not sure I`ll do it to place Brompton bags on the Dahon becouse of the weight limits on the Dahon front block but we`ll see. Maybe for the Brompton "basket".
On the pictures it looks like some of the Basil brackets are metal, not plastic/nylon. I`d like to know if the weight limits is the same as for clickfix. Of course you still need to pay attention to what weights the bike can take without damage.