Gsmarena.com is a widely used website to know the features and specifications on tablets and smartphones. It has gained a wide popularity that if you Google search for any phones gsmarena will be on the top 5 results.
The website is designed in such a way that everyone can easily access. They ordered every information of a phone in a very good way. There are also comparisons available on two devices. There are reviews by the people who used it. The photoes of the device is also available. Gsmarena gives rating for the design and popularity of the device. The information about a particular device will be available on gsmarena before even the device hits the market.
The only problem is that they do not show the price of any of the phones or tabs. Instead they have price group. Sometimes it cannot be understood by everyone. so before buying a smartphone you should definitely visit gsmarena and gain knowledge about what you are buying.