User researcher at Google or Amazon?

Would you rather be a midlevel user researcher at Google on existing products or on new products at Amazon? I'm looking at an internal transfer for Amazon or a position at Google. At Amazon we are shipping new products and services. There is also a ton of room for growth. I know the quality of life is better at Google but I'm worried that the work will be very slow. I've got about 4 years of experience since graduate school and I'm at a transitional time in my career. I'm not yet at "settle down" mode but close to it. Any advice is welcome!