Both set in L.A., both about crime and corruption.
But "Ray Donovan" has more heart and less pretence. The stunning aerial shot across the Hollywood sign, zooming down to Mickey in the motel pool, to the stains of "On the Good Ship Lollypop", was enough for me to confirm that Season 3 is going to maintain the standard of the rest of the series. David Hollander as the writer is certainly kicking goals. Episode 1 was a ripper.
P.S. That being said, the shootout scene at the end of "True Detective", Episode 4 was f**king amazing.