To minimize possible interference from other household devices, headphones using the 5.8Ghz frequency band would usually be preferred over 2.4. That said, 2.4 can work fine depending on the infrastructure/interference at any given location. UHF is definitely better than IR (or 900MHz, for that matter).
I Like to buy wireless headphones for TV. I found that there are 2 kinds of headphones- IR(infra red) , UHF. which is better in terms of low noise etc? in addition if 2 TV sets working at same time how I can assure that I will hear TV1 and not TV2?