Android doesn't even have multitasking UI easily available right from the start. it does have previously opened apps that you can't modifyi or close apps from. I don't know what kind of trained monkeys made the UI for "multitasking".
For me there's really one thing where in the real life want the live multitasking, browser. GS got stuck when i opened more than 3 pages at the same time and usually crashed. I had daily crashes on the browser.
On iphone 4 i have not experienced crash even once.
In use iphone 4 is about 2x smoother, battery last 10hours more than GS.

At the moment i'm quite burned out on all phones and just want something that lasts 2 days and does not lag at all, plus something similar to airplay.
I'am waiting for my Asus transformer though.