If you buy 3 players and they are all valued 114M and you are wondering which of them is the fastest trainer. Then you have to go to the players contract page and press the sell at auction button. Then, and only then, you will see that current players real value in full. Let's say one of them is valued 114 100M, the other is 114 200M and the last one is valued 114 800M. So from here we can pretty much say that the last one with the 114 800M valuation is the fastest trainer out of these three, assuming that they are close to same quality.

Edit: Try not to sell your players accidentally..