Rome is the seat of Christianity, Jerusalem isn't!

Rome was the Mecca of society, where Christianity flourished; with Israelites having no land of their own, Rome carried the name "The Eternal City.” Something tells me you already know this thou, and you just wish to challenge histories prospective on it. Therefore, I say when history is recorded it’s subject to the knowledge/common beliefs of whom is recording it. When it’s viewed, it’s limited by those who recorded it.

The city has been one of history's most powerful and important centres, being the home of the emperor during the Roman Empire and the Italian government. The city also has a significant place in Christianity and is the present day home of the Roman Catholic Church and the site of the Vatican City, an independent city-state run by the Catholic Church. Due to this, the city has often been nicknamed "Caput Mundi" (Latin for "Capital of the World") and "The Eternal City".
Rome was a great city when Jerusalem was in a backward province. Jerusalem wasn't even on the fertile crescent.

But at some point in the future, Jerusalem will be THE city, the only city for an eternity. This will be the New Jerusalem.

Because the victors write the history - and Romans were the victors. Western society is STILL influenced by ancient Rome. If Emperor Constantine hadn't converted to Christianity, nobody outside of the Middle East would give a crap about Jerusalem.