this my way !!
First before I decide to buy, I see the budget that I have. Then I look online for the best reviewed phones until that price range. I decide on operwting system(latest Android) I also look for phones I can more easily buy. personaly, No Chinese phones from shady websites and brands. I look for phones without glaring flaws and which will last a long time(durable, big battery, software updates, lots of storage, good performance). If I've to choice, I''ll choice apple Iphone because Apple builds both hardware and software. Apple works hard developing the software into the hardware, making the best utilisation of CPU and memory. The apps on the AppStore are build by a same code, a same base making it fluidic to use on the iPhones. Moreover, Apple monitors every app on the App Store, bans beta versions and makes sure every sing app works perfectly. Apple developers pay to put their app into the AppStore, which insures every app made works the best way it's meant to be. This also insures no possibility of viruses and illegal items on the phone, that can harm the phone's security.
good luck dude