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I am a 2L at a T14, landed a summer job at a big firm in their White Collar unit.

Would a clerkship look better on a resume for a future potential lateral into Fed Gov, or would doing legitimate WC work be better on a resume?

Both

If you want to do white collar work with DOJ, definitely clerk. If you end up wanting to do something besides white collar after a few years, a clerkship would help as well.