Check the status of Asahi Linux, they’re making a lot of progress on Apple silicon, but it’s very early. I wouldn’t recommend it, at this point.
Do you actually need 64GB of RAM? The Thinkpad T16 AMD would be a good choice, but the T14s AMD has just stupidly low fan noise in Notebookcheck’s review. You definitely want to focus on AMD, Intel’s efficiency is… not great right now. As an added benefit, you get AMD graphics from the APU, so none of the Nvidia driver fuckery, and better performance than Intel.
Personally, I’m waiting for the T14s Gen 4 AMD. The 7840u is zen 4, GCN 3, and TSMC 4nm over the 6850u’s zen 3, GCN2, and TSMC 6nm. The T14 and T16 just hit Lenovo’s model database ‘psref’ earlier this week, so I’d expect them out in the next couple months. The T14s hasn’t been seen yet, I’d guess it hits psref in the next couple weeks. But, I’m prepared to wait into Q4, if need be, and some think I will be.