What is the principle of “Sangha Dana”? f there is only one monk who receives our gifts, it can be counted as Sangha Dana? Which one gives us more merit between presenting gifts to the Order of Monks or to a specific one?

I’d like to ask Luang Phaw about the principle of “Sangha Dana” (presenting gifts to the Order of Monks), and if there is only one monk who receives our gifts, it can be counted as Sangha Dana or not? Also I’d like to know which one gives us more merit between presenting gifts to the Order of Monks or to a specific one.