Nothing else really makes sense. We can look at market share and total size, so there are things there. Everything comes down to saying, this firm vs. this firm. There are no industry statistics worth anything in the area, we can't make any generalized comparisons. Best execution on trades is still a gray area, I think.
Institutions truly get best executions, and they get within the inside national bid-ask spread.
Individuals don't always get that. After-hours trading is a good example of that. I would tell no one to trade after hours because your likelihood of getting best execution is slimmest after hours. Other than that, it's inside information, or what I consider to be inside information. The SEC has yet to really go after these firms.