Whats the difference between an electric and gas furnace? as far as cost and upkeep go?

BS and thats no BS questioned:

I’m looking at Condos right now one has a gas furnace and fill up tank, while the additional 2 have an gripping(forced air) furnace and an gripping fill up radiator.
Which is more pricey to run in stipulations of energy bills? Do Gripping Furnaces last longer then gas? Are they cheaper to exchange? Does an gripping furnace use a heating element or what?(vs a gas using a flame)

The one I’m looking at subdue has an gripping furnace from the mid 70’s. Must i be apprehensive?