I always feel that with both of them in the team we lack creativity and guile to control the game, but with only one of them we lack a bit of bite and physicality, so it's a trade off.
I've not really seen a player with a career trajectory like McTominay, I had completely written him off as someone who would never make it a couple if seasons ago.
For me, Fred is more talented, and probably a better 'all rounder', but there are certain aspects of McTominay's game that lead me to believe he will be a more central figure than Fred. For example, Veron was a much better footballer than Keane, but his time here was not a successful one, comparable to Fred's career here before his recent upturn.
Like Keane, McTominay has that grit, determination and leadership that often sets aside the 'good' from the 'great'. As we all know, football is not all about ability, mentality plays a huge part, and McTominay has a fantastic attitude. Now I'm not saying McTominay is the new Keane, or will become anything like Keane, but for what Keane lacked in ability himself, he more than made up for by drawing that extra 10% out of his teammates.
I think McTominay can emulate that with his passion and leadership, and he also has time on his side being only 23. As of right now, Fred is the superior player and probably forms a more complete partnership with Matic in CM, but I fully expect McTominay to be hugely influential in the coming years in bringing us back to the top, along with Maguire, Bruno & Rashford.