In my opinion, Nico Williams will of course consider leaving for another club if there is indeed a better offer coming from the big teams that can indeed give him hope of winning of prestigious trophy later, Barcelona desire to recruit Nico Williams is of course very big but their poor finances are of course a barrier to getting Nico Williams at this time, In addition to Barcelona, it is reported that several other teams are also starting to try to recruit him such as Liverpool, Arsenal and Chelsea.
A player like Nico Williams is actually very suitable if he wants to be in the Premier League by being in one of the teams you mentioned, because in La Liga he must at least be at Real Madrid if he wants to get trophies in his career. Because if he is at Barcelona, of course there will be very little chance of getting a trophy next season because Barcelona's rivals are still quite strong, like Real Madrid. However, considering going to the Premier League will always be more suitable for him if he is offered by a big team like the one you mentioned.