Correct me if I am wrong, but don't the voting and the non-voting pay the same dividend? So if you buy the NV you get a higher yield as compensation for loss of control. Since individual investors have almost zero influence on big companies, it may make sense to buy the NV.
Comparing the charts of the two types of share, they move almost in lock step. I guess that where they move (usually slightly) out of alignment this reflects take over talk or its absence.