in general terms AEP is much more lax than EZE . But as ever there is always a chance you get a nasty Customs guy looking to get his monthly bonus...

AEP is much smaller than EZE and there is only two scanners i think

I cleared customs twice in AEP last year coming form Brazil but starting off in europe - The Customs guys could see clearly my routing on my luggage tags.

Although I speak Spanish fluently I always " struggle" going though Customs and have my UK passport in my hand . Never had any problems . once my bags were Xrayed and the other time I was sent down the side corridor and throught the exit door.