I would buy a New old stock A1200, because you get a shiny white case and keyboard and doesn't have used scratches on it. The only problem with a NOS A1200 is the price.
The refurbished A1200 is cheaper and they have been fully checked for faulty parts before selling the A1200 to you.
I bought a refurbished A1200 and CD32 years ago and still working.
Buying secondhand is something like winning the lottery, because the buyer mostly checked the A1200, but it is possible when you get it the A1200 will work for years or days. The most problems you can get, are problems with floppy drives, Hard drives and maybe missing the Workbench disks.