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If you haven’t calculated this “at or better” claim, then you are the armchair expert my friend. You have literally no clue what benchmark NBBO was used. The most cynical practice I have seen is benchmarking to a stale NBBO a tick worse& then reporting 10 mils price improvement.
You are correct that I have no clue what benchmark NBBO was used & I agree the NBBO needs an overhaul. On-exchange trading revolves around the NBBO making 50% of the market subject to a stale metric. Doesn't change my argument however (retail doing better than on-exchange)
NBBO is determined on the lit exchanges. The wider the NBBO = the more room your "marketable" orders will have to be of lesser quality using a non-DMA broker. The HFT MMs are Reg NMS compliant b/c best ex is still being met as long as they fill you between the bid offer.
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