Everything Vardy accomplished last season was tremendous but my opinion is (<- key word) is that Costa is on a different level than Vardy. I just don't rate Vardy.
Some people favour costa over vardy however I do think that costa is on a lower level than vardy. The problem is with his arrogant attitude on the field, he likes to pick up a fight and started to piss people off, this kind of attitude is suck even when he has a brilliant performance so it is a waste of talent imo
I hope Costa gets out of the EPL. He is toxic and he was lowering tools last season. That's a red flag if you're a manager looking to sign him. The minute he loses faith and hates his place in the club, he'll stab you in the back and will not give 100% effort. It was one of the reasons why Mourinho had a bad season at Chelsea last year.