My friend did a lot of research and I also done some research
TCL and Hisense are 2 big players with manufacturing facilities. Quite reliable but support is question mark when it comes to SG
Xiaomi is junk. I believe they OEM from some china supplier but the design looks ok and price is cheap. my 3 Xiaomi die and service sucks (full of oem sellers)
Prism I believe also OEM. Service I not sure but products for sure CMI
To be honest, today if you buy a tv brand, best to buy LG, Samsung as they have R&D. Alternatively buy Hisense and TCL because they do R&D in china. The rest all OEM really waste time. Why bother with cimpatiens who use other ppl’s tech