I was previously using IBM Security QRadar. We switched to Sumo Logic Security because it was on the cloud and IBM Security QRadar was on-premise.

I'm also aware of QRadar, Splunk, and Grafana, which are more expensive. 

At my current company, we started with Sumo Logic. That was just because when we started, multiple people had different experiences with different tools and this one came out on top. We also used Splunk for a while.

We started with Splunk — this is back at my previous company in like 2014, 2015 — but they priced themselves out. Plus, Sumo Logic seemed to have a better price-to-functionality ratio.

When Splunk switched their model and went after large enterprises, they left a lot of startups in the lurch. They just left us holding the bag and said, "See ya", and went off and started going after large enterprises.

We have our own logging solution previously.