Better pubg or fortnite??

Tried both. PUBG if you are more into the shooting aspect of the game, realistic weapons. Fortnite, if you don't care about the shooting aspect, and you are looking for creativeness around battle royales. And fortnite is free, so that is a plus.

In my opinion Fortnite has used parts from PubG for inspiration E.g. planes

I would say Fortnite is the better game. PUBG is a way better style of gameplay, but when it comes to bugs and graphics Fortnite comes out on top. If PUBG fixed their problems then I would definitely vouch for them. For now, Fortnite is better which will probably change once graphics improve in pubg.