The pair are together with England this week.
Henderson, on-loan from Manchester United, said: "Harry Kane for sure, he just slaps the ball hard, he just slaps it into the corners, he can go either way, it doesn't affect him no matter where he is he can turn his foot on it so you have to be aware and be constantly ready for it.
"He's ridiculous in shooting drills and that, he's unbelievable. He has such a pure technique and he's so hard to read because he turns his phone at the last second.
"He is top, fair play to him, he is quality."