My favourite part is the reason I like the 2a plus more than other smartphones in its price range. Being able to record 4k video from all cameras is not something most phones at the price range of the 2a plus can do. It’s the cameras. They’re always so fascinating. So small with tiny sensors (compared to pro grade cameras) yet they manage to produce results that look so good. My second favourite part would be the motherboard for similar reasons. It’s so tiny yet is basically your entire phone except for the speakers, battery etc. It controls everything on your phone, has the processor, RAM and Storage and yet is so tiny. It’s all very fascinating