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I doubt AS Roma at this time, although for now both teams almost have the same chance, but it seems that for the first leg I support Porto who will win it. Talking about Roma in their last few matches, Claudio Ranieri's team tends to win at home. As for Porto, it seems that they are more prepared than AS Roma. I think Porto will dominate the game in the first leg, but maybe in the second meeting Roma can reply by playing at home. We'll just see how this match will be held, because we don't know much information about the two teams. By the way, I'm not sure AS Roma will advance like last season entering the semifinal phase of this competition.
Most likely in the first leg, Roma strategy will focus more on the defense line, at least being able to bring home one point from Porto is a good result, although it will be quite difficult because playing in front of the opposing team supporters will at least affect the players mentality. On the other hand, of course Porto doesn't want that to happen, so winning at home will be the price they have to pay. In terms of chances, I see both teams have an equally big chance of qualifying for R16, but it also depends on how prepared and serious they are in playing these two legs.