A 232 tank will have less top (head) pressure so will soon reach your 200bar gun fill pressure then fall off each fill
A 300 bar will take quite a lot longer as by the maths 100bar 1470psi to use up.
With a non diving cylinder (surface) the test period is 5 years, it will have a valve with gauge attached.
Yes the 300 bar is more expensive but will sell on holding value, as a previous cylinder tester using dry air is key,
The small Amazon compressors don't have the capacity to keep the air dry (dry air no moisture clean tank)