I like Can, never understood the hate, but I think Fabinho is much better.
In 50/50 duels Can was always very strong, but his problem was getting there on time. Fabinho reads the game better than Can, which gives him a lot of easy ball wins (Lucas was a master of this btw).
What I really love about Fabinho is how quickly he transitions from defense to attack. When you win the ball, the opponent is vulnerable (especially with pacy attackers like we have). Fabinho is great at quickly finding dangerous open spaces and pinging the ball there. This ability reminds me of Xabi, although Xabi's precision was superhuman. All our other midfielders, Can, Hendo and Gini, need much more time and space to do this, and that extra second means a lot for our attackers.
He's also better against low defenses, simply because he's got great passing skills.
Passing % is a uselss stat IMO. It's incredibly easy to get high numbers simply by playing safe.