It doesn't matter if Josko Gvardiol has to choose and his choice wants to play at Liverpool as a club he has often followed since childhood. At Liverpool Gvordial will have to compete with Ibrahima Kounate and Gomez to convince Klopp to get a place in the main squad.
Unlike at Manchester United, if he is willing to join Old Trafford, then we can be sure he will get the main place because Maguire still hasn't found his best form of play with United.
As a professional player, Josko Gvardiol should consider playing minutes if he chooses to join a new club given his age to continue honing his skills as a defender which will be needed by Croatia at the EURO tournament to be held in Germany.
It will be his decision to choose which club, but playing time is needed so that his skills continue to be honed, especially since the EURO tournament which will be held in Germany is a target he wants to achieve in the future. For competition with Liverpool players, I don't think it's a problem, because Josko Gvardiol has the quality of aerial balls, so competing with Ibrahima Kounate and Gomez is not difficult, even the presence of Josko Gvardiol will make Liverpool's defense even stronger, because they have two defenders who can stay in the air, and it will be even more solid if Josko Gvardiol is a duet with Van Dijk.
While the opportunity to play at Manchester United is getting bigger, because they don't have tough competitors in that position, so it's easier to get a place regularly, but until now there is no certainty that the player will join which club, especially because his contract is still long at RB Leipzig and nothing has been decided yet.