You must not have read that last post where I said Project Butter helped.
And don't be so naive to think that Android is just as smooth as iOS.
I have a Nexus 4. It is the only one out of those mentioned that does not run a custom skin. And custom skins really just bog down the system. And I can tell you from personal experience that the Nexus 4 is not as smooth. That is just a fact. There are specific times when it gets close. There are specific times when it gets ridiculously far from being close. Overall it is somewhere in the middle.
Scroll speed and animation speed is personal preference and has nothing to do with how sluggish a phone is.
Funny how some people always find a way to bring up scrolling speed without properly understand Apple's take on the matter. And seriously, people need to stop bringing this up. It has been beaten to death in these forums.
Androids take is simple, just scroll fast. Does Android take into account how many times you have to flick your finger to determine is scrolling speed to increase? No, because Android isn't that smart. When finished reading an article and you want to go to the top to navigate the site menu to find another article, is there a one-tap way to do so on Android? No, because it isn't that smart.
Let's say for example there is a huge article you are reading. Just to show how big, on Android let's say it takes 50 hard flicks to get to the bottom. Now on iOS, by the 5th flick, scroll speed dramatically starts to increase. At about flick 8, it actually scrolls a certain percentage of the webpage as opposed to a static scroll amount. For example, a hard flick on iOS might first cover the length of the screen and ignore how long the page is. But after a few more flicks, it ignores how big the screen is and pays attention to how long the webpage is because it understands you are trying to get further down. So back to the example, the first flick or two might only move down ~.5% of the page. Meaning you would need 200 static iOS flicks to scroll to the bottom of what would normally take Android 50. But at about flick 8, it ignores everything but page length. And then scrolls go at about 15-25% of the entire page per flick. Meaning it would take significantly less amount of flicks to get to the bottom.
Here is a video to demonstrate how after a few flicks, iOS recognizes what you are trying to do and makes adjustments accordingly:
Android won't make adjustments accordingly. And then what happens when you want to go back to the top? Another 50 flicks on Android. iOS? 1 tap.
Not to mention the first few flicks on iOS make more sense for, you know, actually reading an article. An average flick on Android can take you way too far, causing you to scroll back up and decreasing overall user experience.
But again, this is personal preference. And if you prefer to use more flicks, then go right ahead. I won't debate you on your preference.