Well for 4 months i try to convince myself i needed to try what competition has to give me so well i tried...but back to IP5 for simplicity, smoothness and app world. But let me describe where those phone can't be my daily phone: For the BB Q10 : +Keyboard was awesome +Feeling in the hand very nice, premium handset with nice build. -But app store is awful even if you want side load = not safe at all and i didn't like do it have to use lot of step to put androids app to the phone. -Random lag and reboot -30 days emails services -Update done by carrier and not but BB so if you have a new update with a new app and you can't update then can't install that app. Sometimes have to wait or not see the last update gone -After two months, when go to my carrier all BB 10 phone displayed where completely buggy with screen completely buggy isn't serious at all. For the S4: +Very good screen +battery extra plus sim card +love integration and how google environment work especially for sharing +photo quality was very nice and crisp +Swype keyboard -lag well compared to Iphone yes lag is present even if some people don't see it -camera take time to open so no responsive quickly, i fail shot because of that -battery is something like one day is ok the another quickly drain -android app to me looks cheap and so on -spend more time on customization than other things so kind of addict stuff to always change back change especially with nova launcher. -use that phone for one hand is almost impossible not because of my hand because won't recognize -After some using time swype lag Well after i tried almost best phone in android and BB way, i just move back to the environment that suit my needs in the whole way : -apps and app store is truly the best over there -responsiveness rapidity and liability Every year i tried what competition has to offer and my feeling is still the same: IOS vs Android with a very close fight but android after trying a lot of device on it : S3 S4 Note2 Xiaomi 2S Nexus4 well always let me feel the lag compared to iPhone with sometimes reboot and so on. If i will test another phone in the future...don't think so because iPhone show me that the size is perfect for what i do! shape is very nice in the hand, IOS gives people some of their real need like the control center and the sharing options that's all i need for the moment.