So LG is brand. and I think its have quality, G2 has smaller but higher resolution screen and has alot better chipset. G4 stylus is more like low to mid range smartphone.Diving right into what powers the LG G2 and makes it purr, you’ll first notice a 5.2-inch 1920 x 1080 display, which gives us a 424ppi density and means it still keeps pace with the likes of the Samsung Galaxy S5 and Sony Xperia Z2.
The chipset inside is a 2.26GHz quad-core Snapdragon 800 and as far as processing power, it seems that the G2 is in no short supply.
It comes in 16GB and 32GB variants, with 2GB RAM backing up that meaty processor, while connectivity includes Wi-Fi, Bluetooth, NFC, an IR blaster on the top of the G2 and 4G LTE.