Some people prefer stock Android, just as Google designed it. Others appreciate accessing tools and information in ways that Google didn't envision. The company has clearly borrowed some innovations from these custom UIs, like bring able to open a specific app in conjunction with unlocking the phone (rather than unlcoking to the hom page, then opening your app.)
iOS is a famously closed ecosystem, and whether you love it or hate it is a matter of personal opinion. There's also something to be said for uniformity in terms of your expectations of how a phone will behave, and in offering consistent customer support.
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