Are heroes even worth it?

I'm a th 9 and i have been upgrading my heroes non stop since i got to th 9. I do not gem heroes so I put forth a lot of effort to upgrade both heroes. Since the heroes got nerf, should I continue to upgrade my heroes or should i focus on maxing out my th 9?

I like to work on upgrading hero's and the other stuff too... If you have a good base DE seems very easy to get so if you work on all 3 resources and slow down on your hero's I think you will be fine...