Is there a major difference between generations of iPads for casual use?

My boyfriend asked me for an iPad mini for his bday. He mentioned that he really doesn’t care about it being refurbished or second hand, and only wants it for watching shows and maybe some games. Amazon is selling 4th gen minis for $150. I know they’re on gen 10 now as of 2022, so is it worth getting a 4th gen? I am an iPhone and MacBook user, but I really don’t know anything about iPads at all. Thanks in advance!