What kind of equipment is used for billet on-line heating?

Our company wants to purchase a set of equipment for on-line heating of billets. I found on Google that most of them are gas furnaces and induction electric furnaces. What is the difference between the two equipment?

Gas furnace is generally used for cold billet heating (heating from room temperature to 1100 degrees). The energy consumption is lower than that of induction electric heating furnace;

The induction heating electric furnace is suitable for on-line reheating of billets and continuous casting slabs (that is, secondary heating of the billet). When the billets and continuous casting slabs are reheated, the induction heating electric furnace can be shut down and restarted at any time without preheating, with less scale and low cost. .