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QT usually lack a good biological filtration, and therefore, can easily build up ammonia and nitrates faster than the display and may need water changes more often than a DT. Your DT has a massive support system behind it, from biological to mechanical filtration. Your one QT experience may have been impacted by this. Or it could just be that your fish was stressed from travel and would have done fine after a couple days more in the QT.
Try @Humblefish 's thread on TTM. This is particularly useful and minimizes the possibility of nutrient build-up.
Locally purchased fish, minimal travel. I will look into options though. I am fine having just one fish if QTing is too difficult, or if I fear the ability to find healthy fish