I was asked to do a little session on this the other day. I'd say I'm underqualified to answer the question, as is any single person. If you really needed hard answers to this question, you'd probably look to aggregate data of survey results from lots of developers.
I am a little qualified though. Aside from running this site which requires me to think about front end development every day and exposes me to lots of conversations about front end development, I am an active developer myself. I work on CodePen, which is quite a hive of front end developers. I also talk about it every week on ShopTalk Show with a wide variety of guests, and I get to travel all around going to conferences largely focused on front end development.
So let me take a stab at it.