Since 2009 there has been little effective difference between various HDTV and PC Monitor models in scaling/deinterlacing/framerate conversion operations. There are at least three inexpensive single chip solutions for this that essentially have optimal performance at an inexpensive price. This happy state of affairs results from the nature of all 1080p flat panel displays, which requires that every input signal in every format be converted to the native 1080p panel resolution for display. The manufacturers concentrated on video performance and the resulting solutions are cheap and effective. So don't worry about that aspect of display selection, unless you are buying a used display from before 2009.
Instead focus on the number and type of A/V inputs, the image quality, and the builtin "Smart TV" features. It is very convenient that the HDTV support every online service that the owner has or wants to have, even if he already has other solutions in the form of game consoles, networked BluRay players, Roku boxes, etc. Having the HDTV do such without external hardware gives a lot of flexibility. Another usefull feature if you have and use mobil devices is the ability to accept video streamed from laptops, tablets, and smartphones.