The main startup alternatives are Mixpanel, Amplitude, and Heap. All three are unicorns or are close to being a unicorn. The main issue with GA is it's focused on analyzing pageviews. While you are able to get a lot of information from what pages people are viewing, very little of it is actionable. Mixpanel pioneered the idea of "event-based tracking" where you instrument the actions you care about and run reports over them. This let's you more complex reports like, of after a user sign up, after N months, how many of them are still signing in. Or, how does the conversion rate from users on the free trial differ based on location of the user.
The main enterprise alternative is Adobe Analytics, formerly known as Omniture. Pretty much every really large business that uses an analytics product uses Adobe. IIRC, the minimum price you will be quoted for Adobe is around $100k.
Besides using an end-to-end analytics solution, the other alternative is to use multiple services together. For this approach people will use a tool for data collection such as Segment or Freshpaint (disclaimer, I'm the founder of Freshpaint) to instrument their website. They will send the data from their data collection tool to a data warehouse such as Snowflake, BigQuery, or Redshift. Then they will use a tool such as Looker or Tableau to visualize the data in their data warehouse.
Thread on Indiehacker, some great answers there.
My choice is https://plausible.io.
Check them out. Many are better and faster.
The best ones I found - usertrack.net , gaotcounter, plausible,
Self-hosted (PHP/MySQL) open-core product. Also hosted version available.
userTrack is mostly a self-hosted alternative to Google Analytics and Hotjar (heatmaps/session recordings). It also allows for easy A/B testing.
I am the author, ask me anything :)
Server-side analytics, upsell tool (script interactions on your website), and bot protection all rolled into one.
We're happy to answer questions (see profile) and we'd love to get insight into your decision process.
For enterprise Adobe comes to mind but that's super $$$$$$$