Another thing we noticed with the kornit is that the finished dried print had a better feel than our brother prints, not so much the hand but brother prints always tend to feel tacky when using a large amount of white, they also tend to crack when stretched which was not the case with the kornit.
I came across a post that talked about ink wastage with the kornit, 30% of ink purchased seems to end up in the waste tank, if true that would definitely be a concern. Maybe the new hexa version of the storm has improved this.
I have also been lead to believe that the pretreat is also considerably cheaper being 10 cent rather than 50 cent a shirt.
The mlink does sound like a good contender with lower ink cost and less wastage than the brother, I will get some samples done at m&r uk to see how they come out.
I wonder if the same DuPont ink would work with the brother, and if there is a way to switch it to bulk feed, they are out of warranty so no issue there. I would probably only need to switch out the white ink if bother cmyk will still bond.