CampBX is out for me because it has a dark pool. We've already beaten that subject to death in other threads... I am sure the pump&dumpers, and dark-pool free-market hypocrites will have a great time there, once it gets more volume...
Don't let Dark Pools put you off, because we have also provided a tool to probe dark pools: the Fill-Or-Kill option.
If you suspect a dark pool at a price level, execute a tiny FOK order at that price and you will have your answer!
We have chosen to provide more building-blocks that you can use when building a strategy or a bot. The better strategy will always win in the medium-to-long term, dark pool or not.
Hope this helps,