If you're checking out programs in the Star Alliance, you might want to read BlondeBomber's comparison chart:
Comparison Chart

AC does offer *G status at 35K, but just be aware that you don't get upgrades except on AC metal, since it doesn't participate in the *A partner upgrades program. The Maple Leaf Lounges (MLLs) are quite good though - if you fly through YYZ often - by North American standards.