Super immunity apparently. Even better than a booster. I've gone down this same route and in all likelihood I won't get the booster now. Just don't see the point.
You should get the booster. It's an hour out of your day and any chance to strengthen your resistance is worth it in the long run. There's not enough information on this yet to make any claims on immunity, instead it's easier just to get the jab in case the data goes the other way.
Remember that the jab isn't just about reducing sickness, it's also about reducing transmissibility.