Hello,
There are advantages and disadvantages to both systems:
in solar panels, low voltage forces thicker cables to be used due to voltage drop. On the other hand, if the panels are not all oriented exactly in the same position, it is convenient to use more strings, that way you will have low tension. Whatever the system, you need to know what you want and in what environment you are going to install it, if the panels are oriented to the same side, if you want microinverters, if you want a single inverter, if you want to connect batteries...