OK- question. What sort of mountain biking is this for?
As you know, I’m a big fan of rigid bikes with fat and plus wheels, and use them a lot. There’s no doubt they can be used like you’re a complete hooligan – lots of videos show this. However, they definitely need an extra level of fitness to get the best out of them. A sturdy 650B/29er Full Sus will be much easier to ride when the going gets rough, especially if you’re less fit. However, it’s inevitably overkill for the more bimbly sort of riding.
I reckon you need to decide what you want it for and choose accordingly. As you’ve shown, throwing money at the question isn’t resolving it.
Maybe it’s really two bikes you need?