"Best overall" is nonsensical in this context. Here are some things people care about:
- Size class - a 17" laptop isn't better or worse than a 12" laptop. They're for different use cases.
- Thickness class - thicker tends to make it better at computer stuff and battery life, thinner is thinner
- Screen color quality and accuracy - important to some, not to others
- Touchscreen - yes, no, indifferent?
- Screen aspect ratio - most are 16:9, some are taller
- Screen resolution - most are at least FHD, but you can probably find something worse. Do you want better?
- Upgradeability - can you get to the SSD? Can you put a DIMM in it after you win the lottery?
- Keyboard feel and layout - some of us are more picky than others
- Power supply - does it need to run from USB-PD?
- "OS is not important", but you probably have one in mind and may need to consider compatibility
- Does GPU performance matter? It's 2026 and GPUs aren't just for gaming anymore
- Does CPU performance matter?
- How much RAM and storage is required?
I like my Thinkpad P14s III 6850u, but being a good fit for my needs doesn't mean it's the "best" or that it would be suitable for your sister.
I have a tablet that mostly gets used as a laptop and I rarely touch the screen when I have a keyboard/trackpad attached.