I will tell you a little bit of practice. It does not matter what is better, MicroBT, Bitmain or something else. A good warranty and service periods are important for a miner. Some ASICs are repaired in a month, other ASICs in 3 months, because they are sent to the factory. In mining, you need to take these points into account.
I strongly disagree with your logic, you are saying "don't worry about quality worry about when the miner breaks", this makes no sense to me, i rather buy gears that are unlikely to break than buy a gear that will break and then I have to repair it.