Google suggested this thread to me in my news feed and I registered to reply to this.
Avoid ALL of them. EVERY. SINGLE. MODEL.
Every model of MacBook has severe design issues baked in, that can render the entire machine unusable, whereas a similar issue on a Windows machine would only affect that particular part. I'll give you some examples:
Recent machines connect the display to the board using a ribbon cable. In their infinite "wisdom" apple put the high voltage line for the backlight next to a line that connects directly to the CPU. It is very common for this to kill the entire CPU, hense the entire machine.
Another fault is to do with usb. If the usb/thunderbolt port is even slightly damaged in any way, it can destroy the controller. On a Windows machine, this would break that port, annoying but hey the rest works. On a MacBook, this kills the ENTIRE machine.
Another problem (especially with more modern machines) is the T2 chip. It sounds good on paper, providing security and other features. BUT, if the machine dies, your data is gone. Not even apple can retrieve it. It's encrypted, and the drive is non-removable.
Then there's the biggest issue imo. They prioritise silence over all else, as such the processor will regularly run at over 95c. This is VERY bad from a performance and longevity standpoint, and will kill it eventually.
With a Windows laptop, these issues are easily (and cheaply) fixed, but with a MacBook, apple will charge you more than the price of a complete new machine FOR A DAMAGED CONNECTOR.
Have a look at Louis rossman on YouTube to see apples dirty underbell, one video in particular which features a news article from an American channel where they take a MacBook to apple for diagnosis. Apples diagnosis was : broken screen, dead motherboard (logic board in apple speak). Over $1500 in repairs. They took the MacBook to Louis rossman, who opened it, found the damaged connector, and repaired it FOR FREE.
Other reason include: lower specs for the money, worse software comparability, and as previously mentioned, more expensive repairs. The only advantage they have is the operating system (Mac os), which, to be honest after trying it, is less flexible. It also doesn't have the reliability lead it once had
I understand I may have confused you with technospeak (I don't know your background), but I do hope I've given you enough information to help explain why a MacBook is a bad idea at all, let alone an unknown refurbished model (I work in it, I refuse to use refurb equipment of any kind, too many bad experiences). If you need any more advice, I'll be glad to help.