For right now, sure. Overall higher ceiling: Tsitipas. Already has wins over each of the GOATS. Mevdev only has one win and against Djok.
The thing is, winning over the Big-3 is not the goal. That actually might be the reason that these nextgen players are losing so much. Such huge pressure from fanboys and the media to "beat the Big-3".
Perhaps, just maybe, these players need to focus on the long game. Improve the fundamentals. Improve focus. Improve consistency. Take small steps now which will pay big dividends later. PLAY THE LONG GAME.
You look at Tsitsipas, Zverev, Aliassime, Shapovalov etc... and they seem to be reaching for conquering the Big-3...instead of focusing on how to hold their form. How to peak at the right time. How to build momentum. How to sustain level.
And then you look at someone like Medvedev. Hated by most on this board. Why? Because he's slowly developing. He isn't flashy. But he's slowly showing improvement year-over-year. He is focused and humble. He is progressing slowly and naturally. He is working on consistency. Working on focus. Working on his game. He is not taking the same path as most of his cohorts. Slow but sure.
And that's why I think Medvedev will win the race. I truly think think is a case of "turtle beating the hare".