I found my stress level high at Facebook (been here for less than 1 year). I think it is because of the focus on impact and moving fast culture vs good quality engineering work. I have never worked at Google before. I know this will probably depend on specific teams but will the work culture generally be better at Google in those aspects?
Culture at Google varies a lot. But in general feels more humane than fb. There are teams that have extreme work pressures and there are teams that are relaxed. Also a lot depends on L6 and L7 and how they set culture in their teams.
This exactly summarized my impression too (more humane on average than facebook but with large variance by team). It's fairly easy to change teams at Google (current manager can't really block), so finding a good team is possible if you have patience.