I don't know a lot about Sporting Lisbon -
But the difference between him & Ten Hag is really down to Ajax.
Ajax had a great deal of young players coming through at the time Ten Hag took over and coached them very well.
We have seen this with him coaching Mainoo & Garnacho well.
However, I'm not sure he actually built Ajax up. Felt like a young Ajax were built for him to coach by the heirachy of Ajax.
This is seen by his building of United with consistent poor transfers & even players he has coached before being a waste of money and being very poor quality. Most of the players he coached at Ajax came through the youth system such as Onana, De Ligt, De Jong, Mazroui etc.
Now with regards to Ruben Amorim has the team been built up for him by Sporting Lisbon heriachy?
It doesn't matter as much since now INEOS seem to have much more of a say on transfers than the manager alone - but if Amorim helped build Sporting up then it does show that he has an eye for quality in a player, something Ten Hag unfortunately lacks.