Which empire covered more land, rome or constantinople?
Pretty plainly Rome, as Constantinople only ruled the Eastern Half of the former Roman empire. But this may be a trick question, comparing the Roman Empire not to the Byzantine but to the Ottoman Empire, ruled as it was from Constantinople (Qustantiniya to the Ottoman administration, NOT Istanbul). The Ottomans had the E and W shores of Arabia, Mesopotamia, Armenia, Romania, and Transdanubian Hungary, all of which the Romans never had entirely or for long, but they never had Western Europe or Morocco. So I would still say more was ruled from Rome.
Rome. The empire with its capital at Constantinople, the Byzantine empire, was initially the Eastern half of the Roman empire, and was not overrun by barbarians in the 5th century AD. Although the Byzantines acquired some territory on the northern shores of the Black Sea that had never been part of the Roman empire, and conquered some portions of the old Western Roman Empire (for example North Africa), it never really rivalled the old Roman empire in size.
