Both really, his strongest position is off the striker playing on the shoulder I think but he can play as a winger.
He tends to play wherever there is space from Atletico he isn't afraid to run off the channel, I find him quite often playing off the striker which is why it's hard to say he's a winger, a CF.
It's really hard to say he's a striker, or he's this I see him as an inverted forward a little bit the way he plays.
I went to see Atletico play Barcelona last year and despite Torres scoring the only goal for Atleti there was something about Griezmann.
I remember an interview with Rene speaking about the qualities of Griezmann it was in 2013, maybe 2014 but I think that's one of the biggest downsides to letting Rene go.