I think one of the most impressive things with Wijnaldum is that he can score with his feet and his head. For a MF, that's very unusual, and a huge bonus. In fact, most of the goals he scored last year came from headers. He can come in from deep into the box and put away the cross, something that will be useful against parked buses. Benteke could score with his head, but he is mostly static, and easily marked. Not his fault entirely, as strikers do end up in advanced positions well before the ball arrives.
I really like our buys this summer. He is the one perhaps I'm most impressed with, even though it seems like he wasn't Klopp's first choice to fill that role.