#Earnings $GOOGL has not been a big mover in the last few years, save for one large move up in July 2015. Looking at the last 12 quarters, the stats are: Biggest UP move: 16.3%, Biggest DOWN move: -5.4%, Average move: 4.3%.
If you remove the one 16% outlier, it changes to: Biggest UP move: 5.6%, Biggest DOWN move: -5.4%, Average move: 3.0%. You would have to go back to Jan 2012 for a move DOWN over 6%.
So, selling puts is safer than calls, and the range for either has been fairly tight, save for July 2015.