I would pick asus if I had too, but I would DIY a pc, because its incredibly easy. There might be some better brands out there, I don't know since I never buy pre-build pcs because they are a waste of money.
I built (DIY) a PC for the first time three years ago, I thought it was easy too. I even bought the expensive chassis from Fractal Design made in Sweden. The PSU I am using is Antec. Everything was bought from authorized local merchant..
What I got in the last three years??
1. Frequent sudden bluescreen
2. Sometimes it gives out STRONG unpleasant or burning smell coming out from the PC, but I NEVER know exactly where it is actually coming from, but pretty sure it's from the PC
Today , for the first time, it gives out VERY STRONG smell that I cannot endure anything. I think it's very unhealthy. The PC is still running, still getting on the internet.
However, I do not even know where the problem is.