I think Arsenal should play like the first game. If they play defensively against Real Madrid, maybe Real Madrid will be able to capitalize on that. If Arsenal plays their normal game and Real Madrid will have to attack and find opportunities, a goal they can find will bring them the next round. That's why Arsenal should be on the pitch in Spain, playing their own game. They shouldn't allow any surprises and I don't think they should play defensively. Right now, their chances of advancing are very high.
Arsenal plays differently at home and away, and yet such a score in the first match was possible only thanks to the excellent execution of Rice's free kicks, otherwise Arsenal's victory would have been much more modest. Of course, today Arsenal should not think only about maintaining the score that they managed to achieve in the first match, they also need to attack, because if they sit in defense the whole match, they will start to concede. Real will be charged and will run to attack from the first minutes, these first attacks will also be important.