Based on? Sid's done best recently with a guy who is either cerebral and good with the puck (Guentzel) or who has some speed as a puck carrier (Rust). I just feel like Sid needs more skill/playmaking out of his other winger at this point.
Also, it doesn't help that Mangiapane is tiny. We really need to stop stacking Sid's line with guys who are smaller than him. If Mangiapane was 6'2 and 200+ lbs to go along with his other attributes, that's one thing. But he's like 5'10 and a 180 lbs. on a line that's already small by NHL standards.