Why is it that every monitor i buy/use is subpar compared to an almost 10 year old lg "monitor tv" that my mom bought back then and was used almost non stop for 5 years?

Just spent 600$ on a samsung something something, its curved and freesync and whatever and then i put it next to the old lg and the samsung is so washed out and flickery.

I bought a LG 4K monitor that has AMD FreeSync because there was a huge discount for Prime Day. Arrived today haven't unpacked but my PC actually has a GeForce 1080...

Did screw up and but the wrong monitor? Or does FreeSync/GSync not matter much?