Archer30, if you don't use arrays in heavy loops, use whatever is simplier for your task. For heavy loops (100000+ iterations every turn, for instance), you MAY use static arrays in the most significant and most often called functions.

The task above is easily solved using static array and array index access syntax is quite readable numCombiArtPieces[i]. In complex cases use trigger local dynamical array. It's easy to create, fill, sort, pass to another function, etc.

Static arrays are for really simple tasks.