ToS!!! By far the most powerful AW early on!
Upgrade it to lvl 6 as soon as you can (and don´t bother with any other AWs until you do, none of them will help you nearly as much, I would say). Later in the game (in maybe 2 years or so, when you reach chapter 15) you will probably want to delete it again, so don´t go overboard upgrading it.
The ToS saves you enormous quantities of space by replacing loads of workshops (and that saves you from building more residences and culture)!
The GA is an amazing AW later in the game, but early on, it is far worse than your regular residences. So don´t waste your precious space on it right away. Build it when you reach the guest races and when you have no other more pressing AW projects, but don´t expect wonders from it right away, it needs a high chapter of your city and a high level on it´s own to really shine, it´s more of a long-term project.