Is it better to cast or wire cut a slingshot?

Seems like nowadays casting bows are all die-cast, still use sand mold casting? Then there will be no sand holes, if there can only be pinhole-like air holes, it is difficult to reveal after processing, even if revealed can also be filled with resin glue in a vacuum state, it is difficult to find after sanding, the wear and tear of the tendon is almost zero. So the casting bow is a very good choice, bought several casting bow, feel the surface quality is very good, the only drawback is the bow eye slotted at the parting surface is not dealt with, where it is difficult to hand sanding flat, or suggest that the bow trader to let the foundry sanding before the goods before the field, after all, the factory's machining equipment is more accurate than we use hand sanding.