Third party brands? What's that mean?
Samsung and LG are about the only companies you're likely to come across that make their own panels. Companies like Asus, Acer, MSI, Dell, as well as AOC for that matter use panels by people like AU Optronics (AUO), Innolux, and recently Panda (no, for real, there's a company that makes panels called Panda and they're
rather good). As well as LG and Samsung panels.
Most monitors that are curved VA panels seem to be Samsung. MSI seem to use a lot of Samsung SVA in their products.
I'm no expert on who uses what
AOC is a
major player in the monitor market. They're not some Amazon/ebay only operation selling cut-price, low quality goods, and are a way bigger brand than people like Sceptre or EG. Not that brand size matters; EG have had some decent stuff. AOC are top-tier, same level as all the other big names.
AOC have a wide range of 1080p 144hz monitors (which I agree is what you're looking at assuming ~200£/$/€), including TN, curved VA, and IPS options. Some of them are quite popular like the
A review of the AOC C24G1. A curved 23.6" VA monitor with Full HD resolution, 144Hz refresh rate and support for AMD FreeSync.
pcmonitors.info
A review of the AOC G2590PX. A 24.5" Full HD TN model with 144Hz refresh rate, slim bezels and support for AMD FreeSync.
pcmonitors.info
A review of the AOC 24G2U (24G2). A 23.8" Full HD IPS model with 144Hz refresh rate, Adaptive-Sync and a generous colour gamut.
pcmonitors.info
(VA, TN, IPS respectively)
But tbh, just about any monitor that's 1080p, 144hz,
and has freesync (which rules out a few older BenQ and Asus models still floating around) for around ~£200 would be fine