Pros: Internal tooling is amazing. SRE best practices are standardized, enabling you to work on novel solutions.

Cons: Power has shifted away from the common Googler and out of the company.

Pros: Perks and benefits galore. Google has incredible health plans, retirement plans, and paternity leave. Coworkers are extremely bright. Lots of fun facilities. I prefer the flat corporate structure.

Cons: Google has an enormous codebase. Lots of jobs are just doing maintenance to keep your service up with the many internal monolithic tools that are constantly being deprecated. Solutions tend to be overwrought in order to "demonstrate complexity" for promotion committees. So much competition when you are basically a cog can be discouraging. Many coworkers work in evenings and weekends. There is no 20% time. It is really difficult to get promoted when there are very few open slots.

Pros: Good compensation package, flexible hours, some very smart people to work with, and interesting projects at a large scale if you are lucky.

Cons: Google is a large multinational company, with all the bureaucracy and inertia that implies. If you get a decent manager and an interesting job, it's alright. If you get a bad manager, that could make your life very hard.