Bro considering all posts / replies / opinios across forums, as of now Airtel PQ is considered best & TS is best for AQ. Also Reliance PQ is considered best for all channels on their HD STB.
TS PQ was considered best prior to migration as there were fewer channels with less compresssion. But now with addition of channels / migration to mpeg4 & use of advanced heavy compression has made PQ bad.
What TS has done is they have maintained AQ level somehow but PQ level is being compromised for other factors.
So someone having 4K TV can claim that he is getting best PQ on TS but other may note pixelated or bad PQ. At the same time all will report that AQ is very good like DD+ which is measurable. So the advantage of not able to properly measure PQ has resulted in split decision about TS PQ.
All this is my opinion, you can go thru' different threads across forums to help decide about PQ.
So if you have bigger TV set with screen size more than 40" then consider Airtel or Reliance if possible. Note that SD is going to be there in India atleast for next 10 years & most channels are in SD. Also we are considering only PQ & AQ factors here.