I have never edited video in anger, but my son borrowed my M1 13" MBP (16G RAM) to edit a 4 camera 4K shoot. Obviously it did not all happen in 10 seconds, but he was massively impressed coming from an i9 Windows laptop with lots of RAM which was just dropping things all the time and being generally unhelpful. For him it was the smoothness of the operation. There was no fuss from the machine at all. A 2nd hand M1 16G Mac Mini can be 650 on ebay if you hang around a bit. Unless budget is an issue (and when is it not?) then I would not consider anything older than an M1.