Ruy Lopez for white, and some Pirc-Caro-Kann-thing for black
Favorite opening
My favorites with white for years has been Spanish (=Ruy Lopez) and Sicilian, of those two Spanish is number 1. My favorites with black for years has been Caro-Kann and Sicilian with Caro-Kann as number 1 and if white started with d4 then Kings Indian Defence and lately Modern Benoni. Well, has been I said, they still are, but I frequently try out other openings and sometimes get hooked with that opening. With white I can get really hooked on King's Gambit and with black Dutch.
I also play other openings now and then, but my favorites as mentioned above remains favorites, I tend to play Modern Benoni more often than Kings Indian Defence, so it has become my favorite answer to white 1.d4 along with 1...c6 inviting white to play Caro-Kann or if not then it will often turn into Slav Defence (1.d4 c6 2. c4 d5 instead of 1.d4 d5 2. c4 c6).
What is your favorite opening. White or black