Latops are a peculiar thing... I own a Dell notebook, so I can't comment on Lenovo's or many others. As for that link... that's the same old case from 2003-2005 given in that link, and Dell was just one of many OEMs afflicted with bad caps. Of course their trying to cover it up was despicable, but all of that happened over six years ago and was regarding desktops. I never had any issues getting them to repair my laptop. To be honest I don't think anyone's laptops are particularly well built except maybe the Macbooks, but those tend to cost exceedingly much for it. A person could buy two regular laptops for the same price as the Macbook Pros.
I've been looking at some laptops recently, I really don't like how HP turned the touchpad into a physical left-click button on many models, but that might be me. The battery life figures on the Dell 15 and 15z both are really good, and the 15z is probably the closest thing to a Macbook around, although it runs a little more than the vanilla 15 model because of it.
Either way as Nibiru has said, don't worry about aspect ratio. Almost every laptop should be 16:9 these days, a few are still 16:10. The laptop's LCD resolution is more important.
There isn't much difference between "home" and "business" laptops other than the business models sometimes have better build quality. Off the top of my head, I'd say any business laptop can perform the same functions as a home laptop. Overall, the hardware inside is more important.
You need to figure out what the laptop's main use will be for, then spec it accordingly to match. For example, if you're still going to use a desktop PC then you don't need a beefy or tricked out notebook... usually saves ya a few and you can get a machine with much better battery life that is nicer to cart around.