This site is good but l think GSM areana is more good site .As you can know and compare all the features of the different mobiles and then you can select one. This site is also give you information about the mobiles and laptops.You dont find many mobiles also just for ex:- Sony xperia Z5 dual.
I hope you to try more good sites other than this. ZYou can try out more sites like https://91mobiles.com/compare-mobile-phones.html, or https://gsmarena.com.