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Jagged arrays are faster and have different syntax.
They are faster because they use the "newarr", vector IL calls internally.
0 Even if the rows have the same length, a jagged array is sometimes preferable to a rectangular array because it's easy to extract a whole row and pass it to another method, say, for further processing.
With a rectangular array, you have to create a single dimensional array and copy elements to it for the row you're interested in.