Understanding what one loses when switching from stock to AOSP

Hi there. A friend I'm helping out with has a Z3 Compact. She doesn't like a bunch of the bloat that comes with the stock experience. I was thinking of helping her install AOSP on the device, but have heard around the water cooler that you do lose more than just the stock bloat ware. So far it sounds like the main big points that are lost are...

- Better camera for night time shots
- Better over all power management/saving

Is there anything I'm missing?

Beyond that, I'm wondering if there's a prebuilt AOSP based rom that has the camera and possibly the power management stuff rolled into it?

Thanks!