I can't say how you would define best. The DaVinci Code was certainly widely read and loved by the public, and while I was eager to turn the page to find out what would happen next, I would never say it was "great writing." Hollywood routinely awards the Oscar to "outstanding films" that I have no intention of ever seeing because the subect matter is not enjoyable to me.
I don't think this is a question that has answers - only opinions.
Four of my favorite books of all times were Atlas Shrugged, written by a Russian woman first published in the US in the 1950s; The Shell Seekers, without doubt a romance novel, written by a British lady in the 1980s, Pillars of the Earth, written be a contemporary British man; and Pride and Prejudice, by Ms. Austen. It's hard to be more wide-rangning in those choices. None of them are Victorian English novels.