For me, at least in my saves, Aboubakar is hit and miss. Sometimes he goes to a team like Arsenal and tears up the Premier League or he turns out ***** wherever he goes. In my current save he moved to Bayern. They got rid of him after a season to PSG, who then got rid of him right away too for under £5m.
Icardi is a goal machine but his mentals such as teamwork and work rate really put me off. He can also be very inconsistent, particularly when he's still at Inter.
Jovic turns into a monster. Probably the most complete striker out of the lot after a few years and probably the cheapest so i'd have to say he is the best from what i've seen in my saves, but you'll have to wait a bit longer for an impact as he is very young.