The Mac or the Lenovo? I'm not sure about the Macbook's bundled SSD. For the Lenovo, I'm incorporating the cost of upgrading to a 1TB Samsung 970 Evo Plus NVM

The Mac or the Lenovo? I'm not sure about the Macbook's bundled SSD. For the Lenovo, I'm incorporating the cost of upgrading to a 1TB Samsung 970 Evo Plus NVMe SSD (which has a stated sequential read/write speed of 3500/3300 MB/s). And because the Lenovo is not using a proprietary connector (as my current Macbook is) and does not have soldered RAM (as my current Macbook does), I can upgrade both of those components down the line too.