An electric grill is the only wide cooking surface on this page that burns nothing. That single fact is most of its case. There is no flame, no fuel to carry, no exhaust, and therefore no carbon monoxide, which makes it the only one of these you can reasonably use under an awning or inside.
The cost is that you need somewhere for roughly 1,500 to 2,200 watts to come from. On a hook-up pitch that is trivial. Off grid it is the most demanding thing most people try to run, and it needs a battery and inverter sized for it rather than a power bank: see power for cooking.
It is also slower to recover than gas or charcoal. Put cold food on a hot plate and the element spends a while catching up, because there is no reserve of glowing fuel underneath doing the work.
Worth knowing: an electric grill draws its full rated power for most of the time it is on, unlike a kettle or a hob, which reach temperature and then cycle. For battery planning, assume it is drawing near its rating throughout.