Tata Sky :
Pros - Good HW / CC Service / Good AQ
Cons - Costly / Less channels / No seperate HD pack (need to subscribe to higher packs for all HD channels)
D2H :
Pros - Good no of channels including all south channels / Cheap
Cons - HW problems (with RF HW) / CC Service / SD PQ for big screen TV
This comparison is according to the views of various members in forum & relative.