Seriously, there is no such animal as "the best". Find one you like the look of online, see if you can see it working in a shop, and try playing with it if they'll let you and, if you still like it, buy it and be happy.
Yes, two weeks later, Bubba down the street will have a TV ten times as wide, with millions more options, a remote that needs a wheelbarrow and several thousand connectors but so what?
Yes, your TV/Monitor will be obsolete before it's even shipped from the manufacturer, again so what?
If *you* are happy with it then it is by definition the best.
That said, I'd go for an AOC monitor of at least 23 inches with as many connections as possible for as little money as I could find one costing. Why? Well that's what I'm using now and it's very good.
I admit to being biased.
I love things that work.