The Points Guy highlights the Iberia Visa Signature Card as a solid choice for Avios collectors, offering lucrative sign-up bonuses and valuable perks despite lacking some standard benefits. On the other hand, the Aer Lingus Visa Signature Card, as reviewed by The Points Guy, boasts its unique benefits tailored towards Aer Lingus loyalists, including special discounts on in-flight purchases and companion ticket discounts. While the Iberia card focuses on Avios accumulation, the Aer Lingus card emphasizes enhancing the overall Aer Lingus travel experience.