Two cloud titans are pouring cash into AI infrastructure, making them good investments for investors looking to capitalize on the AI boom. But which stock is a better buy?Amazon (AMZN +0.06%) and Microsoft (MSFT 0.06%) enter 2026 with the same headline tailwind: enterprises are rebuilding their tech stacks around cloud computing and generative AI (artificial intelligence). Even more, they have similar headwinds: the capital-intensive nature of building out AI infrastructure -- and more AI demand than they c ...