Ask HN: Specializing in DevOps vs. Full Stack Dev

My current role is "DevOps/Platform Engineer". I write a lot of glue code that hooks different Cloud services together. CI/CD, Docker, Config Mgmt, etc. It's fun and it pays the bills. Recently, I've enjoyed learning Ruby on Rails outside of work. I like the fact that everything is contained in a monolithic application VS tiny microservices scattered across different cloud providers. It's less mentally taxing I believe. So I'm curious about salary/job growth of DevOps/Platform engineers VS Full Stack Web Devs. Does one pay more than the other? Does one have more or less competition?