How's it relevant if you're not "playing video games on it like a fucking virgin"?
That being said, I've never seen a significant "slowing down"-effect on neither android or iOS (I've had an ipod, friends have iphones too) so I can't really relate to that specific problem on any platform. Makes me think if it's up to user more than the OS.
Anyway, I'm not really biased towards any manufacturer or OS, I just get slightly annoyed by absolutely pointless arguments when it comes down to preferences.
PS. my shitty samsung is working out just fine, even when I'm playing video games like a fucking virgin.