There is no distinct pecking order that i see. The differences at the top are pretty fine. A player may just be tipped with a few sweeteners more from one club than any other. Having your parents house and debts paid off with a little extra to live well may appeal very much to some people. Others may have grown up wealthy and not as susceptible to such offers. The clubs that want them may already have an established star in your position; with the expectation you work into it when you feel ready to take on the world. Another big club may be weaker in that area and make the bold decision to guarantee you x playing time in league matches, even have it written into contracts. Gabriel Jesus was very much wanted by Barca but at the time we looked the better option for him. If we had 2 top strikers at the time he may have decided not to risk it and go somewhere else possibly.