Atalanta's chances are better than Marseille's in this match, so I think they will be in the Europa League final this season. However, they should not underestimate Marseille at all, because Marseille is also very likely to give them a defeat and prevent them from being in the final.
One of them will most likely face Leverkusen in the final match, because Leverkusen are now 2 goals ahead on aggregate in the first leg at AS Roma headquarters, and now they will play in their own stadium and will get full support from the fans.
I will now focus more on the Leverkusen vs Roma match which was actually more interesting. Even though no goals were scored in the second leg, both teams made this match fierce. Although Leverkusen certainly made the most attacks and dominated the match. But Roma also made some good attacks at the start of this match.