1. Well, first of all I'm not a heavy user who will use custom rom or any other advanced things.
2. Pure android doesn't matter much to me or constant update also.
3. In my country, at Bangladesh Z1 is only 50 US dollar more that Nexus 5.
4. It is rainy season also in my country. So Z1 is better I think.
5. Only problem is I use Sony Xperia Go now. So UI is quite a bit similar as my Xperia Go running 4.1.2.
So suggest me a phone WHICH HAS LESS BUG if possible Thanks in advance mates