Gas. Always and forever. You can cook on cast iron on your gas stove. It would scratch the shit out of a glass stove. Glass is harder to keep clean and ages worse. Never have I accidentally burned my self on a gas element. You always see the fire. Nicer for braising, searing and starting a pot roast. If you get one with a grill in the middle it's great for warming up flat breads, toasting buns, warming wraps. You can get accessories to make it a great flat top. To make pancakes for a whole brunch. But it also depends on how you cook. If you are always fighting for counter space and like to use rice cooker, slow cooker, insta pot. And bake your tubers. You can use a glass top to use other cooking devices. Gas ones may or may not have covers for your elements so it's only ever stove top.