Porto have a better record for head to head against Roma, Roma have recorded two wins, two draws and a defeat to Roma. The home side has shown resilience in their recent fixtures and have proven to be a stronger side playing at home with a good home record compared to Roma's away performances. I predict Porto to get a win against Roma in their Europa League meeting.
I believe more in Roma in this match, where even though Roma has a not so good record when facing Porto, and this will be an away match for AS Roma, but currently Roma is slowly returning to its best form, in the domestic league they are able to make changes that make their position better.
Meanwhile, currently in the domestic league, Porto is gasping for breath to be able to maintain its position in 3rd position, lately Porto has experienced a series of bad results.
However, this is just an assumption, and we will never know for sure how the match will go, before the match really ends.
While I agree that Roma is doing much better compared to start of the season and they have found a good momentum thanks to Ranieri, we are also talking about Porto who is a better team right now. I understand wanting the team you like to win, but at this point no matter how much they have "improved", I still see AS Roma to be not a good team this season. I suspect Porto to have a much better season and shouldn't really be doing anything good at all, would definitely hurt their possibility without a doubt.
Hopefully we see entertaining games though, that's the most important part, if we can see how these games can be found, we could assume safely that entertainment value should be high since both teams have good capable players that can score a lot.