You say that you have no time to play games, yet you are considering two machines that are primarily designed for gaming.
That said, if I were to choose between them there would be no contest - I would buy the Lenovo. The Dell machine falls short when it comes to display quality, and that would be enough to deter me.
I'm not sure why you say that Dell is "way more trustworthy". Lenovo machines are generally excellent in that respect. I have used Lenovo laptops for years, and have had no cause to complain.