What tools are you using to monitor your F5 syslogs?

I've been using Splunk for a while but was wondering if someone has compared Splunk with ELK stack?

Any pre-build parsers ready?

I've seen comparion between Splunk & Nagios. Here's a comparion between Nagios & ELK that you may find interesting. A bit old but good read... https://labs.nagios.com/2014/10/19/nagios-log-server-vs-elasticsearch-logstash-kibana/