My standard advice for flat screens - go to Costco and get the biggest you can afford/fit. The brand almost doesn't matter anymore. I think only two places make the screens anyhow. Costco extends the warranty by a year and they have a 90 day return policy if something better pops up. I've had great luck with Vizios. Pretty much everything in the 50" range is going to be 4k even though you will be hard pressed to find a lot of 4k content.
The only thing I would seriously advise against, particularly with the size you are considering, is a curved display. Flat is way better than curved until you get into super huge displays purpose placed in a theater-like setup. In an office you'll be standing, walking around, etc. and the curve will be a huge issue.
Shopping for TVs has become like shopping for widgets. They're all about the same so size and price should be the deciding factors.