External batteries are fine if you're willing to go that route. I actually have ocd and I prefer both. 
I only an extra oem battery for my galaxy S II as well as the 10,000mah anker astro3. If you had to choose one or the other, I would recommend the external battery as you can switch it from device to device. If you had a spare battery for your phone, it'd do you no good in the future if you replaced it with another device.
I only an extra oem battery for my galaxy S II as well as the 10,000mah anker astro3. If you had to choose one or the other, I would recommend the external battery as you can switch it from device to device. If you had a spare battery for your phone, it'd do you no good in the future if you replaced it with another device.