As with intel, I would recommend not really paying attention to the 3, 5, 7, 9 numbers. Those are just marketing vague indicators; ideally of performance, but realistically just of cost.

Instead, look at the actual model numbers and seek out benchmarks performed by groups you trust with workloads similar to what you might actually do with them. E.g. If you are a gamer, look for comparisons between CPUs as to how they perform in various games. Linus Tech Tips do videos about recent CPU releases and compare how they do vs the competition in a bunch of games, and it shouldn’t be hard to find websites with the same kind of comparisons.

But also, yes, they are due to release a 9900x3D and 9950x3D early next year, supposedly. I am keen to see if the 9950x3D is symmetrical this time around; the 7950x3D was asymmetrical so I avoided it.