Cast iron has superior heat retention for even cooking, restaurant-quality searing. It's also ridiculously strong and rugged.
Use with confidence on all cooking surfaces: gas, electric, induction, oven, broiler, grill, and even the camp, a campfire, or the fire pit.
Your wok can rust so keep it out of the dishwasher, do not soak and dry immediately after cleaning. Use warm water, scrape any stuck bits with a spoon, a little elbow grease with a rag and finish with a paper towel.