In my opinion, AC Milan often plays on the wing, which makes you assume that AC Milan plays openly. And if that was true they wouldn't have good capital by achieving 7 consecutive wins in all competitions and also wouldn't be in second place in their league. Apart from that, in AC Milan's last two matches against AS Roma, AC Milan always won.
And in the first leg of the Europa League quarter-finals, AC Milan is the favorite because apart from playing at home, AC Milan is better than AS Roma and this is a match that will indeed be a fierce match, but in my opinion AC Milan will beat AS Roma with thin score.
Anything can happen in international league, there's no team want to lose at knockout stage, while domestic league is long, so you can't expect all the players can perform in every match. Even though it's clear Milan is better in anything to Roma, but it's not easy to beat Roma.
Usually Europa League is full of surprise or upsets.