Its 2014 people ! Stop with the android vs ios fight.

Ive used low-mid end android, iphone and now nexus 5
Use your brain, if you buy rm600 android phone memanglah lag compared to ~2000 iphone .

My nexus 5 is super fast, no lag in between swithing apps and all. The camera delivers its job pretty decently.
Battery-wise , it can last all day from morning till i reach home at night with medium usage which is quite similar to the iphone ive used.

In the end, its all about personal preferences. You really have to try both devices and compare which suits your needs more. Stop being a fanboy and boast about what your device can do/what the others cant. Open up your mind.
Peace