There is not one specific type of wiring that is ‘better’ than the other across the board. However, you may find that one style of wiring works better for your specific solar energy system. Different factors come into play here. For example, solar panels wired in parallel operate independently of one another. They're best suited for partial light situations or when some of your panels may be under shade for part of the day. Alternatively, series wiring is better for sunny, open spaces where nothing will obstruct access to sunlight.