I'm favouring Juventus for advancing to the semi finals. I'm aware of how successful Sporting are in this tournament.
However Arsenal and Juventus are not the same type of teams. Each of them has a special kind of game plan for themselves. Sporting's game somehow worked well in the rematch and it led them to even eliminate Arsenal which were the biggest favourite team for the Europa League title. But Juventus' style can be really boring and maybe problematic at the same time. If Juventus outweigh them they can get past them narrowly on aggregate.
Against Arsenal I would say Sporting got lucky in both legs. In the second leg once they grabbed the equalizer Arsenal weren’t that experienced to get back into the game. But a similar pattern might not work against Juventus because they are more experienced. This is the only competition left for Juventus to fight for and winning it will grant them automatic qualification to next years champions league. But juventus have a problem also and it is the recent pattern of playing around Dimaria. Without him they get lost. If he should get injured or Sporting finds a way to mark him out of the game it will create problem for Juventus and sporting could easily dump them out