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FWIW I dev on an M1 Max MacBook Pro and it’s the best computer I’ve ever owned.

Maybe the best thing about these M3 chips is that they’re making those older machines more affordable.

Fwiw, I have a 16" M2 Pro and had a close call with losing it to water damage, so I picked up a M2 Air and it is FASTER than the Pro for most of my jobs (electron/Xcode dev). The Air is so much lighter that I much prefer it to the Pro. The Pro now lives at my desk via TB, and the Air in my backpack for pretty much everything else. Weirdly, when I look at GeekBench browser I see that the M2 Pro should be faster, but at the time I've got screenshots of it being a Pro @ 2.7 GHz and Air @ 3.5 GHz... and I just checked again right now (at my desk) and the Pro is running at 3.29 GHz, so the dynamic CPU scaling must have had an effect. Yet, the actual work doesn't lie, and everything feels super snappy on the Air. Truth to YMMV.

No, keep the M1 Max. M1 Max has bigger RAM & better GPU compared to M3 Pro.