I'd just issue yellow cards to both. Saying that other players are worse doesn't mitigate the issue, it's just whataboutism.
Forget pundits for a moment, people are extremely critical of tough tackling footballers these days like Pepe or Adam or even Ramos these days. Watch a match from 01/02 and have a look at some of the tackles that were flying about in the Premier league and compare that today. There has been progress made behind the scenes in reducing the number of leg breakers that were considered 'normal' and no doubt that's a trend that will continue as football gets more technology focused.
But that's all beside the point, Neymar yesterday was worthy of condemnation. Rolling around and trying to get your opposition sent off and putting pressure on the referee is pretty fucking low as far as I'm concerned. That is just as bad as a deliberate handball or diving for a penalty. Sure, it's not as bad as a leg breaking tackle but it's not a million miles off either. And, I don't know about you, but Neymar is also likely to simulate contact when there is none as much as Suarez or Robben or Harry Kane - the game against Costa Rica is proof of that.
Also there are plenty of exceptional dribblers who are lightweight and attract tackles that don't roll around quite as much. There's being light on your feet and then there's this.
