My god, some of you have got suspect memories.
Momo was shite 80% of the time, all of the time.
Lucas is consistently average at least with a few cracking games a season, Momo either turned up and bossed things or was a total mess; for every Chelsea and Barcelona there was a Crystal palace, Sunderland,Blackburn,West brom,Arsenal,Utd,Spurs,Villa,Norwich,Sunderland,Bolton, Birmingham, city, Everton, Fulham..
In terms of footballing ability, there's zero contest, only one of the two is capable of kicking a football.
Sissoko was also played in a system which suited him down a T - I.E little to no footballing ability required, 100% athleticism and grit required.
Lucas is played out of position, nine times out of ten.
Neither at their best have been good enough to warrant a first team slot..