As any vendor could add more video formats later, any reply can be outdated in minutes.
Your post sounds like you are trying to get a PC in your TV. If so, you are going to be very upset later.
Which brand and model are best in LED Tv below 30 inch size
type - LED Tv
Size must be below 30 inches
Maximum video format support
USB Hard disk drive support
Additional features welcome if ....
Full HD & upgradable firmware software
Let me know 4-5 model which are best......