The best gaming tv according to rtings is the 55inch version of your same model.
https://www.rtings.com/tv/reviews/best/by-price/under-1000
idk if the 50 inch is as good might be. Sometimes with the smaller sizes they take features out though. 50$ more saves you the head ache its 599$ at best buy and might be on Amazon too
https://www.bestbuy.com/site/vizio-55-class-m-series-quantum-led-4k-uhd-smartcast-tv/6464673.p?skuId=6464673
they just say they tested the 55inch on rtings and consider it the best