TM: I would agree that they're all within the same range, give or take $20.
Only, for some broker comparisons, that might be give or take $20/month, while others might be give or take $20 per order.
If you trade more than a few times a week, with something less than a 7-figure account, that's the difference between making a good living and a decent return, and being a net loser.
Commissions do matter.