Dear Aspirant,

You could use either of them. Delhi domicile is advisable if you are applying for a college with reserved seats for DELHITES. However, if you are applying under the All India Quota then it will not bring any difference, yet if you have done your +2 from Delhi then in the domicile fill in DELHI, and at the time of document verification use your schooling documents.

Hope this helps.

Thank You.