Micro-SD card slot
LG G4 :Micro-SD card slot support up to 2TB
Samsung Galaxy S6 : No Micro-SD card slot
Without a Micro-SD card slot, you wont be able to buy micro-sd card off the shelf and increase your phone storage freely and cheaply. Micro-sd are very affordable nowsaday. LG G4 comes with 32GB internal storage and you can easily increase the external storage with a SD card cheaply. For Samsung Galaxy S6, it only have built in storage and no micro-sd slot. Internal storage comes in 32GB, 64GB and 128GB version and every incremental in storage will set you back by a $100! ( A 64GB micro-sd cost just $28 only )
Removable battery
LG G4 comes with a removable battery but Samsung Galaxy S6 have built-in non-removable battery. Meaning for Samsung S6, you have to use powerbank for extra power and if the built-in battery is spoil, you have to go to a service center to replace the battery. ( extra cost )
Changeable Rear Chassis
LG G4 Rear chassis can be changed but Samsung Galaxy S6 rear chasis cannot.
With a changeable rear chassis, you can easily change the look and feel of your phone. You can go for the metallic look or the real leather back of G4.
These 3 reasons: Micro-SD card slot, Removable battery and Changeable Rear chassis make LG G4 a clear choice over Samsung Galaxy S6 / S6 Edge
