Lenovo Yoga 900 vs/ Macbook Air?

I need a replacement laptop and have gone without one (to save money) for about five years now. I've been mainly using a home Windows PC at home that I use regularly everyday for several hours.

I've had laptops before but they always die out because of my constant usage. Ideally, I want a laptop that can withstand everyday (8-10 hours usage) without slowly deteriorating in performance. I multi-task ALOT and mainly use it for simple word documents, video watching, Netflixing (more like Net-binging!), downloading the occasional torrent and play the occasional steam games (think medium-light gaming)

I really need a laptop though, that will endure like forever! And I've heard the endurance that Mac laptops have, but kind of worried that I won't get used to the Mac OS because I've always worked with the Windows platform. Not sure if I'll transition too well.

But I love the Yoga 900 design and the fact that I can convert it to a tablet so I can comfortably play Steam games in bed.

Can anyone give me any pros/cons on getting one or the other?

Lenova is a Chinese brand, and has a reputation for being pre-loaded with spyware. You did plan on doing online banking, right. Asus is just as bad.

Mac is loaded with problems. Oh, you heard it is immune to malware? Think again. Just goto any mac forum and read. You will see that mac has no end of problems.