Each has its own features:
SUN TV - for its excellent picture quality and music system
(the same movie which you see in Sun tv, if you watch it again in Raj Tv, you will see the difference)
Vijay TV - for its uniques programs like Jodi No:1, Kalakapovadhu Yaaru, Neeya Naana? etc;
Raj TV - for being impartial towards any party and news
Jaya TV - for graphics used during any programs, in this context even Vijay TV is excellent.
Before a few years, SUN T.V was the best channel. But after the recent transformation of VIJAY T.V,it leads the list according to a new survey.
SUN T.V was and is one of the greatest channel India and of course the whole world got. But nowadays a few programmes of VIJAY T.V is copied by the SUN T.V. The best example is VIJAY T.V's Kalaka povathu yaru and SUN T.V's Asatha povathu yaru. But if the question is considered for the whole world the answer would be SUN T.V.
On the other hand a well known fact is that SUN T.V and JAYA T.V support D.M.K and A.D.M.K respectively. Therefore showing the power of media against each other is has become a powerful tool for both the party members.
JAYA T.V is always secondary in rating when compared to SUN T.V. RAJ T.V gets the least rating due to it's poor audio effect, poor video effect and poor maintenance.