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A big advantage of pressurized tanks is that the nitrogen will stay in them for years, they hold proper pressure and volume, regardless of time. It will always be ready to go in an instant (if the valves work). However, the pressurized tank owner (if you rent it) usually charges a rental fee for the tank, and that can be expensive over time. If you have a possibility, it is better to purchase a pressurized tank and refill it when needed.
Pressure tanks should be tested every 5 years and they are date stamped for the last test. Refilling stations may not refill if the test period is beyond the nominal test date.
