Moving away from Google Analytics. Thoughts?

I'd like to move away from Google Analytics for various reasons. I'm wondering, what's a good replacement tool? The most important functionality I want to replace is the ability to see traffic sources and then analyze the behavior to understand my best-performing channels/sources. I've looked at Mixpanel. I'm also using Heap and Fullstory. From what I can tell, Google Analytics can automatically determine things like source and medium, while other tools must be manually told via UTM parameters. Any insights? Thanks so much in advance!