Roma pass vs Omnia pass

It really depends on what you plan on seeing. Many times it is cheaper to buy individual tickets for the sights you want because so many places are free (Pantheon, Trevi Fountain, Spanish Steps).

Looks like the Omnia Pass is the Roma Pass (with Transportation) but with added access to the Vatican.

The omnia pass is a huge waste of money. You can't possibly see enough sites in 3 days to make the omnia pass worth the 95 euros they want to charge you. It's hard enough to make the romapass pay off these days and that only costs 36 euros. Do the math to see if either will pay off. I know the omnia pass won't but you may benefit from the romapass. You can buy that by visiting the official site:

http://www.romapass.it/p.aspx?l=en&tid=2

If neither pass will save you money then just book entry tickets online and use the metro or buses as needed.

Donna

Reservations for the Vatican are not that much to make up the cost different between these two passes. Donna is right. The Omnia pass will be quite a bit more expensive. The Roma pass will probably cover what you need it to and then just buy separate reservations for the Vatican.