Avatar World is the other big sandbox - the one people compare to Toca Life World when they argue about which is better. Its strength is the avatar editor: faces, outfits and details go deeper here than in most games of this type.
After you've built yourself (or someone entirely new), the city opens up: apartments to decorate, streets to explore, and small surprises tucked into the corners of every scene.
If character creation is your favorite part of sandbox games, start here. If world-exploring matters more, you'll want Toca Life World too - most players end up switching between both. Free, browser-based, no account.