I think Suarez had/has a) more strings to his bow, i.e. you could see him playing any one of half a dozen roles nevermind just positions, whereas Salah whilst not entirely one-dimensional, is a little more specialist in that he seems like he can play one or two positions brilliantly, but if you stuck him in central midfield say – he’s be fucking useless, whereas Suarez could probably hold his own, AND…
b) Suarez just seemed a little more energetic. When he was playing he was always somewhere on your screen – he popped up everywhere, influencing every move, every stage of play… He was kinda like Firmino with Salah’s goals. Salah on the other hand is a stealthy little fucker that only really seems to get interested when the ball’s at his feet, or when he thinks it might get to his feet – either through harassing or a through ball. It’s hard to believe he’s scored this many goals, not because he looks shit or anything, but just that he does it with such ease. He scores goals like De Gea makes saves these days.
I think Salah’s the better finisher and goalscorer out of the two, Suarez the better all-round player.