Ortofon tonearms ,Static and Dynamic - Difference?

In static arms VTF is adjusted via the movement of counterweight and in dinamyc arms a spring does the job. In theory is better to balance the arm to "0" with the counterweight and then apply the VTF by "other means", but from another point of view there is always the issue of vibration coming from the spring, but Ortofon claims to have solved this problem in this new design...I would say static Ortofons are intented for the heavy SPU range of cartridges and Dynamic for a wider group of brands and models.
If there is enough "real estate" in your turntable...please go 12"

Sorry, I have realised there has been is a mispelling and it is just the other way around: dynamic for SPU and static for the rest