I am a bit partial because I am from Aragon and have lived in Zaragoza many years. I think Zaragoza is worthy a visit specially in Pilar Festivities but you must like or not dislike crows too much. It depends also on how much you know about Madrid and how much you know and want to know about Spanish festivities. Also in your budget, because prices are much higher during that time.
You have lots of free events and also you can visit the main three sights: El Pilar, La Seo and La Aljaferia. Of course the old city as well, El Tubo, the tapas bars, etc.
I think zaragoza people are usually very welcoming.
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