1. Quality tools.
2. Take care of tools.
BOTH equally as important. I have seen so many mechanics and DIY'ers that never take care of their tools and will leave them out in the rain, thrown in a heap inside their tool box, all over their garage and home. You might as well not even have them if you are just going to treat them like crap. This also goes for mowers, cars, motorcycles, boats, etc. when people beat the ever living crap out of them time and time again that thing will start but when it fails to start they always blame the machine when it is the operator that is usually at fault for neglecting to properly care for the item.