Yes, if these two players leave Liverpool at the same time, it will certainly cause a major disruption to the club’s offensive system, despite the presence of Firmino and Diaz, so the Liverpool club must preserve Salah and not allow him to move to another club by negotiating with him about the costs he needs, perhaps Liverpool club management will succeed in persuading him, this is what we hope.
As for me i think I will prefer one player to go for the other, their combination don't seem to be as expected, Sallah is good quite alright and Mané is skillful as well, but one thing i noticed about Mohammed Sallah was that his performance has dropped drastically unlike before, its on a rare case you will see Sallah not making a goal in any of his match, so its either Sallah go nd leave Mané behind or other way round for them both, i think they should have a rethink in that aspect and i will personally prefer Mané as against Sallah to stay.
If choosing, yes, it's an obvious choice, Mane looks much more chipper than Mo. But I don't think they need to part with both players, they are each useful in their own way and do their job. I think they each have a player they work well with, showing results, and it seems to be working because Liverpool are in very good form