You can trust Google to always do the best. Google scrapes data from around the web, and presents it to you in a way that’s useful for you to use. The price comparison feature of Google Shopping is just a part of the search engine itself. All you have to do is search for the product under the Shopping section. When you click on the product that you’re interested in, you’ll be presented with a few photos of the product, a product description, reviews, and pricing information from various different retailers. Products are automatically listed based on the lowest price showing as the first option, but if you’re not fond of a particular retailer, you can expand the options and see the full table comparison.
I do not like the security of this apps. By default any one in my home can just open it up and start buying things on my account. I would like it to just add things to my cart on the TV and them buy on "My" Computer or "My" phone. I know you can setup a PIN for "videos, purchasing and certain types of content".But, you then need to enter the PIN for $0 videos. Also, anybody with access to the Fire TV remote can just install the apps and start buying things, no pin, no password, just because you have a Fire TV setup on your account. Amazon you need to have a separate PIN for Buying videos, parental control (ratings), Apps and Shopping. And by default the app should setup a PIN.