Isak joining Liverpool is one of the best decision he has made, every football prays to go higher and he is going higher he need trophies and this can be achieve with Liverpool than Newcastle United.
Good purchase For Liverpool, a good alternative for Ekitike, who, even though his career in Liverpool has started well, still needs backup or competition, and Isak provides that competition.
Then talking about who will excel more between Isak and Wissa in their various team without even been told you should know that it is Isak who went to Liverpool, Liverpool is big team ...
You can't really say, because Isak can move to Liverpool and become a total flop, and Liverpool's season can end if players lose motivation. Wissa, on the other hand, can become the striker for Newcastle that they have been missing and the spark to their season.
It is football, and there is no script for it; the season is still fresh, and Liverpool are still basking in the glory from their last season.