Match material to the job
PLA is easy to print and works well for prototypes, decor, and many indoor parts, but it is not the best choice for heat or impact.
PETG is a common step up for practical parts because it has better toughness and temperature resistance while staying approachable for many printers.
Think about the environment
Parts used in cars, outdoors, workshops, or near motors need more heat and UV resistance than a desktop organizer or display model.
ASA, ABS, nylon, and reinforced materials can solve tougher jobs, but they may require enclosure, drying, ventilation, hardened nozzles, or slower tuning.
Printability still matters
The strongest material on paper is not useful if the printer cannot produce it reliably. Choose a filament that matches the machine, enclosure, nozzle, and skill level available.
For paid jobs, repeatability often matters more than chasing the most exotic material.