Tatasky is costly compared to Airtel. I'm not sure what Catch up TV is. I will explain you what it is (as per my experience with TS so far) - you can watch the previous movie (In case of movie channels) and Programs telecast an hour ago (in case of GECs) right now. Currently, the four famous Hindi GECs, Two Hindi movie channels, One English movie channel has this +1 service. I'm using Annual Plainum South Pack and all channels are available for me.
PQ of HD is as good as Airtel in my Samsung TV.
I request other TS members to answer any other query I may have missed. Thanks.