It's nuanced UI-related. There's a lot of psychology involved to understand the holistic effects. You need to include things like someone's brand perception into deciding how effective a UI will be, such as trusted brands will let someone assume that what they are looking at is trustworthy - and therefore of enough value for them to care and look further into it / to get interested.
It's the brand of the company that matters; It's the foundation for what a user will expect, and will let them trust what they are seeing in front of them as valuable to them - prior to even knowing anything specific about it.
I'd say a lot more goes into a company's revenue than two single product landing pages. Don't use Apple's earnings as justification for all it's actions.
McDonald's sells the most burgers in the world, that definitely means it's the best in everything burger-related right?
http://www.apple.com/iphone/ vs https://www.google.com/intl/en/chrome/devices/chromebox.html
I'd say Google's doing a better job.