Polished software is important. But Nokia has outsourced most of that to Microsoft now. The SGS2 and SGS3 dying in 3-4 hours? What do you mean? Like playing a 3D game? The SGS3 is one of the most battery efficient phones on the market now. Are you saying a WP7 phone can outlast it? In Anandtech's benchmarks I've only seen WP7 phones with mediocre battery life and very poor Sunspider performance. I've seen nothing that shows that overall WP7 phones are more battery efficient than Android so far.