In this situation I don't think it matters so much where they play, if they are really ready to seriously fight for the championship in such a hard fought game at the end of the season - then they will cope with the pressure of playing away. It's actually nice to see them playing so well for the second season already, in the past they were hampered by injuries to players, in this one nothing has hampered them so far
The thing is playing at home gives you the edge of your fans backing you against just anybody, going away is tricky at the current moment in the league. The away fans might actually be a nuisance especially when it is that of a rival, they push the home team to win. Arsenal or the other clubs coming to fight for the title needs to up their games and prepare themselves more when visiting the away side. A clear example is the resilience of the Manchester United team that almost snatched a win against Liverpool at old Trafford, should that game been played at Anfield it will have gone at least a more favourable way than it is now. This is not to say that the home games are easy to play but not as complicated as the away games