For me it doesn't really make any difference, I do tend towards Marketmakers as the margins are lower and I HATE IRESS.
I use IG and CMC. IG lets me enter in and out of the position using either DMA or Marketmade. I don't really like their system though
CMC also have DMA and Marketmade. Systems are a little better.
In the end though, its all marketmade. Dma is just acessing a different "market made" arena.
