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Focusing on the EPL will prove to be more beneficial for the Gunners.
The Champions League boasts advantages for Arsenal, but overall, Premier League success should come first and foremost for Arsène Wenger's club.
Coming away unsuccessful in EPL play would prove to be too damaging for the Gunners. Champions League play may help fans forgive some EPL struggles, but players Arsenal could potentially seek via transfers would hesitate to join a losing club.
It should be trivial for Arsenal to key in on their EPL fortune this year, but focusing on Champions League success doesn't always have to be compromised. This isn't so much of a one-or-the-other situation as it is about playing sound football that will help Arsenal, no matter what sort of match they're playing.
All things considered, Premier League victories are something that the Gunners can't replace with international success. There's something unique about taking down your rival clubs that creates a lasting impact among fans and players, and that's where Arsenal's attention should be directed in 2012-13.