Well, you could more efficiently use memory with [][] I think, since you could nullify specific areas of the array and thus let the data be picked up by the garbage collector, compared to it always being allocated.
Edit: Another thing is that each sub-array can be variable length with [][], whereas [,] is basically a square array.
Aside from that, I think it's personal preference.
Edit: Another thing is that each sub-array can be variable length with [][], whereas [,] is basically a square array.
Aside from that, I think it's personal preference.