GA4 vs UA: comparing Google’s reporting platforms

From July 2023 Universal Analytics (UA) will no longer process data, leaving anyone who hasn’t got a grasp of Google Analytics 4 (GA4) by then at a serious disadvantage. I recommend using GA4 from July 2022 at the latest to give you a full year of comparable data once that transition happens, as well as time to wrap your head around the newer system.

There are some major differences between GA4 and UA. GA4 has significant advantages over UA that help make data collection more convenient. However, it also lacks some key features you’ll be used to from UA and that you will have to learn to live without for now, so the transition will be challenging. Here’s where GA4 gets it right, and some of the downsides you’ll have to anticipate as you make the switch. 

GA4’s advantages over UA

GA4 comes with some important new features which you can read about here. These include AI insights, more specific Google Ads Audiences, brand new exploration reports, built-in events, and automatically depersonalised PII. 

On top of these additions, GA4 has made some clear improvements on features found in UA that give it an edge. 

Better event tracking

GA4’s event tracking allows for more specification than UA’s. 

For example, in UA you might collect data on all the times forms are filled out across your pages. With GA4 you can specify whether these forms are newsletter sign-ups, contact us forms, or surveys. What UA would only define as email addresses, GA4 can break down into addresses for a business’ HQ, its customer service, and more. Engagement can be divided by type of content like videos and infographics. 

This degree of specificity pays huge dividends when it comes to analysing your data down the line. Instead of grouping your data into broad categories and leaving you to parse through searching for trends, you’ll be able to analyse the way audiences use your website on a more forensic level.

Greater accuracy 

A lot of the data you can collect in UA is useful from a comparative standpoint, but is not reliably accurate in its own right. If someone visited one of your pages and then left the tab open while browsing elsewhere, for example, UA would continue to record that as their session duration. 

As a result you might have an average 4 minute session duration that people are actually abandoning earlier. You might still be able to glean some insights by comparing with a 4 minute session duration to one with a 2 minute session duration (assuming that both are, on average, off by the same amount of time) but that level of inaccuracy still leaves a lot to be desired.

GA4 goes a long way towards fixing this. It is able to tell when a user changes tabs, recording a more accurate session duration from the user’s perspective even if they’re still technically on the site.  GA4’s metrics are generally more accurate across the board, which is never a bad thing from an analytics standpoint. 

UA’s advantages over GA4

GA4 gets rid of some major conveniences that you may be used to in UA. Here are the upsides of UA that you’ll have to learn to live without once it stops processing data in 2023. 

More standard reports 

In UA you can rely on a wide range of standard report types which will put your data together for you.  

GA4 has far fewer standard report types, often leaving your data harder to understand. UA is more accessible in this sense, while analysing your data in GA4 requires you to spend time making your own exploration reports. 

There are already more standard report options available in GA4 now than there were at its launch, with more likely on the way. For now, however, UA’s greater number of standard reports keeps it easier to navigate than GA4.

Longer data retention

When it comes to UA’s advantages over GA4, data retention sticks out like a sore thumb. UA lets you retain your data indefinitely, allowing you to compare data across multiple years. 

In contrast, GA4’s default data retention is just 2 months. You can change this in your settings – in fact, you should – but even then you can only extend that retention to a maximum of 14 months. 

Even if your data retention was shorter in UA you would still be able to see a lot of your data in your standard reports. GA4’s fewer standard reports makes its data retention issue worse. 

You can keep all your GA4 data by integrating it with Google’s BigQuery. Not only is this mass data collection less organised, however, but it also requires you to learn how to use a whole new system on top of the learning curve that comes with GA4.

At the end of the day you’ll have to prepare to transition away from UA no matter what. You should, however, consider UA’s advantages over GA4 and prepare for some of the conveniences you will lose so that you can make that transition as smoothly as possible. 

Learn more about GA4

• How does cookie-less tracking work in GA4?
• Why you need to switch to GA4 sooner than you think
• 5 GA4 features you need to know about
• GA4 FAQ: your GA4 questions answered
• GTM event tracking for GA4

More help

For more help making sense of Google Analytics 4 and your website data, read about our Analytics & dashboards services or email me at [email protected].