It's almost impossible to get a final answer here
You can get good cards from miners who cared about cards, good temps, good fan condition etc, but it's an electronic device, and even with all cares, you can have an issue in a few months
You can also get a good card from a miner who only cares about Mhs, 100% fan all time, hot condition, but the card can handle a couple of years more.
Miners can get cards from gamers too
In a gamer PC, the card will have less use, probably 4 or 6 hours daily max of intense use, but the voltages, temps, and frequency are more volatile, while miners are stable
We can have a good comparisson with cars like user above said
Do you prefer a car used in big cities for example, with more usage of engine, brakes etc with less mileage
or
a car with more mileage, but only used in roads?
Hard to get an answer, but I can conclude the price is the key factor here, if you pay a good price, you can try an used card, I have some friends who bought RX 470s from China miners, and cards are still running for casual gamer