From an in-world perspective, perhaps the DS9 comments about genetic manipulation being banned were an exaggeration. Perhaps (like Federal vs states rights in the US), there is an overall ban on genetic manipulation in the Federation, but certain planets/territories allow it. The extent of manipulation allowed may also vary between planets depending upon their overall history with genetic manipulation.
We also don't necessarily know where Darwin Station was located. Was it inside the Federation, or outside in "international waters" so to speak.
From a real world perspective, it strikes me that both stories have different reasons for being. The Darwin Station story is about science untethered (or paraphrasing Jurassic Park terms, "They were so busy asking themselves if they could do something, they failed to ask if they should do something") Bashir's story seems more about the consequences of being ostracized or treated as "other" simply for who you are or for the "sins" of your parents. It is also perhaps an argument against overregulation of science--Bashir, a smart, funny, and personable doctor is the result of medical procedures banned in the UFP. Interestingly both are counter arguments that work as a push/pull to the other.
We also don't necessarily know where Darwin Station was located. Was it inside the Federation, or outside in "international waters" so to speak.
From a real world perspective, it strikes me that both stories have different reasons for being. The Darwin Station story is about science untethered (or paraphrasing Jurassic Park terms, "They were so busy asking themselves if they could do something, they failed to ask if they should do something") Bashir's story seems more about the consequences of being ostracized or treated as "other" simply for who you are or for the "sins" of your parents. It is also perhaps an argument against overregulation of science--Bashir, a smart, funny, and personable doctor is the result of medical procedures banned in the UFP. Interestingly both are counter arguments that work as a push/pull to the other.