Sa'id bin al-Musayyab (may Allah have mercy on him) narrates from one of the Pure Wives (may Allah be pleased with them): "Sacrificing a jadha'ah ram of sheep is more beloved to me than (sacrificing) a musinnah of goats."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19076