I presume the relatively low fee they received for Mane was a bit of a quid pro quo for Thiago, which is fair enough I guess. Seeing the tabloids portray the fee as some kind of victory for Liverpool is a bit much though, if not unexpected.
Both moved at exactly the same age. Both in the last year of their contracts. Both moving for fees a few million apart. Both great players.
The most obvious difference is that one had an abysmal injury record, while the other's is near perfect. Mane averages 10-15 full games a season MORE than Thiago.
Strangely the Thiago fee was presented as the biggest bargain in football history. There are a bizarre number of stories about the transfer which mention Michael Edwards, as if he pulled off some kind of magic trick in fooling Bayern to pay so little.