I wonder which 1 year old Android phone you had...
There’s a reason even 5-6 year old iPhones still work like a charm on iOS even today. The hardware is much better integrated and supported by the software.
And no, there's no integration story. Android has issues iOS has not (and the other way around), but performance wise they're pretty comparable on similarly specced devices.
Unless you're comparing a flagship iPhone against a lowend Android, you won't see as big of a difference.