Don't know if the Mirage has a game mode, but you don't need it either for some casual flying. Imo it's learning curve is way less, a lot of simpler systems and weapons deployment. It also has a great campaign, and it's very fun to fly!
A10C more complex, steep learning curve imo, only ground attack, bit has AIM9 for self defence.
Mirage, kinda multi-role, pretty accessible and easy to fly!