I think you have to be careful. What is best, probably, is a factory refurbished item, from the manufacturer; with some kind of guarantee or warranty. I wouldn’t by anything that wasn’t “factory refurbished.” I have had some luck with those kind of things but just with relatively minor products and appliances. I would never buy electronics from some unknown source, refurbished by who knows who, without any kind of recourse if the thing doesn’t work properly.
But, I have to disagree with @Blackberry about used cars. I have always purchased used cars. I’ve never owned a brand new car and have always done well with used cars. Though, I have always bought my used cars from a reputable dealer, a new car dealer who also sells used; so I’ve payed a little more for them than I would buying used from a private party. They, dealers, have a reputation to maintain, at least, even if they don’t offer a warranty. I just “graduated” from simply “used” to “certified pre-owned,” with my last and current car, my 2005 Subaru Legacy Outback Wagon. I love that car and have not had many problems with it. The catalytic converter went out, a $1000 repair, but that was covered under the manufacturers warranty so it was fine. And the car cost me about $10,000 less than a brand new Subaru of the same type.