Asus has generous terms for their warranties. 3 years plus accidental damage IIRC. HOWEVER, and this is a big however, they have absolutely horrible customer service and term around time when it comes to the RMA process.
I have RMA'd a dead laptop (mobo) and 2 other dead mobos, and the turn around time was over a month for all of them. Each time I had to call countless times to get status updates; the whole process wasn't moving along at all. They will also attempt to "repair" your equipment instead of issuing you new components. I had to send a mobo back twice once because their repairs weren't adequate. They also make you pay to ship the equipment to them (this is normal for a lot of companies however). I like Asus products, but after the last time this happened I swore to never purchase from them again.
I have never dealt with Lenovo customer service, but I hear their RMA process is pretty friendly.