Onderzeeboot
Ecstatic Orb
This largely comes down to whether you want your gold lands to support midrange and control decks (the vivids), or if you want to throw aggro decks a bone. Not only do City of Brass, Mana Confluence, and Gemstone Mine enable first turn fixing for aggro decks, they also come with a cost for the slower decks, a cost that aggro decks can prey upon.