More realistic than Fortnite, requires a bit more teamwork, Not overly violent though.
Graphical Content: There is shooting involved/bullets, in a more realistic manner than Fortnite. However, I wouldn't call it overtly violent - there is no gore, actual blood that I've noticed, no brutal executions etc. No sexual content, drug use, nudity.
Gameplay: Gameplay is enjoyable, I would say its a bit more team-focused than Fortnite. As of now you must be in a squad of 3 players every time you play, either with friends you know or the game will matchmake with other people. Vocal communication is a key part of securing victory within the game - Children may be exposed to unsuitable language in this case, but not more so than other online games. Playing with their friends would be advisable if this is a worry.
Game is a bit more difficult than Fortnite I would say, there is no building aspect so you are forced to find cover rather than make it. There are also skills unique to each character "Legend" which are also a key part to winning games. Knowing when to use skills to support the team and also yourself is important and takes some time to learn. However, I wouldn't say its an overly difficult game to learn - kids who have played Fortnite should jump into it with relative ease.