An 2021 M1 Max 64 GiB 2 TiB is only $1800, while an average 2024 M4 48 GiB 1 TiB is $4000. I'll take 1/3 more RAM over just slightly better performance and worse reliability for half the price. As long as the battery has at least 85% of life remaining and the SSD doesn't have excessive volume of wear, it's a better choice unless you absolutely needed every second of time and you're making $1M TC or owning a startup with a funding run-rate / TTM crunch like you're going to turn into a pumpkin at midnight.