best is subjective. I like Monoprice. I think they are the best for the money.
I have added at least one cat6 and rg6 to every room in my house and the one spot I have an issue is the Lowes plate because I had a hole that a double gang plate needed to cover. So I got one with a 2x3 keystone retainer and the 'nylon brush' hole covers for cords going up to the tv. It's probably OnQ, really never was impressed by anything of theirs, their keystone blanks are way too bulky.
90% of the data I've done in my home is Monoprice cat6 cable, ends, keystones, patch panel, covers, you name it. I am an IT guy. I often wind up taking over projects people get in over their heads, and have used most of what you could get locally from the common places and I think they're all ****. A few of the ones from amazon, newegg, etc aren't bad.