idk
Hikaru Nakamura

He's got the strength of a top player, plus the mouse-speed and mindset of a dirty flagger. It's a lethal combination.
Only a handful of players can claim to be his equal (or better) at online speed chess, on any given day: Alireza, Danya, Magnus ... Maybe Arjun and Nihal, too ...

I think Nakamura is better than Carlsen many times
They're both pretty close in online playing strength, though I'd say Carlsen has a slight edge.
Here's their current record against each other, in blitz and bullet on chess.com:
Magnus: 64 wins
Hikaru: 45 wins
Draws: 56
Why do you think that Hikaru Nakamura is the best online player?